TOP 30 Urgent care with lab in Pennsylvania
Search for local businesses, places and services near you
- United States
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
- Ukraine
- United Kingdom
- Italy
- Poland
- Australia
- Spain
- New Zealand
- France
- Germany
- Ireland
Water Street Urgent Care: Arevalo Juan C MD
Water Street Urgent Care, led by Dr. Juan C. Arevalo, is a premier healthcare facility located at 1009 Water St #1, Meadville, PA 16335, United States. Specializing in urgent care services, this local clinic is dedicated to providing immediate and comprehensive medical attention for non-life-threatening conditions. Whether it's a sudden illness, minor injury, or any other urgent health concern, Dr. Arevalo and his experienced team are committed to delivering high-quality care with a compassionate touch. With a focus on patient well-being and prompt service, Water Street Urgent Care ensures that the Meadville community has access to essential healthcare services when they need them the most.
Patient First Primary and Urgent Care - Lancaster
"Patient First Primary and Urgent Care - Lancaster" is a premier healthcare facility located at 1625 Oregon Pike, Lancaster, PA 17601, United States. Specializing in both primary and urgent care services, this clinic is dedicated to providing high-quality medical care to the local community. The experienced team of doctors and healthcare professionals at Patient First is committed to offering comprehensive and compassionate care for a wide range of health needs, from routine check-ups to urgent medical conditions. With extended hours and a convenient location, Patient First ensures that you receive timely and efficient care when you need it most. Whether you require preventive care, treatment for minor injuries, or management of chronic conditions, Patient First Primary and Urgent Care in Lancaster is your trusted partner in health.
Peters Township Urgent Care Center
Peters Township Urgent Care Center is a premier healthcare facility located at 3840 Washington Rd, McMurray, PA 15317, United States. Specializing in providing immediate medical attention, this center is dedicated to serving the community with high-quality, efficient, and compassionate care. Whether you are dealing with minor injuries, illnesses, or require other urgent medical services, the experienced medical professionals at Peters Township Urgent Care Center are ready to assist you. The facility is equipped with state-of-the-art technology to ensure accurate diagnoses and effective treatment plans. With a commitment to patient satisfaction and well-being, Peters Township Urgent Care Center stands as a reliable and trusted healthcare provider in the McMurray area.
Uniontown Urgent Care Center
Uniontown Urgent Care Center is a premier healthcare facility located at 289 McClellandtown Rd, Uniontown, PA 15401, United States. Specializing in providing immediate medical attention for non-life-threatening conditions, this center is dedicated to offering high-quality, compassionate care to the Uniontown community and surrounding areas. With a team of experienced healthcare professionals, Uniontown Urgent Care Center ensures that patients receive timely and effective treatment for a wide range of health concerns, from minor injuries and illnesses to routine check-ups and diagnostic services. The facility is equipped with state-of-the-art medical technology and resources to support comprehensive care. Whether you need urgent medical attention, vaccinations, lab testing, or preventive care, Uniontown Urgent Care Center is committed to addressing your health needs promptly and efficiently. No appointments are necessary, and walk-ins are always welcome, making it a convenient option for busy individuals and families.
Royal Treatment Urgent Med Cr
Welcome to Royal Treatment Urgent Med Cr, your premier destination for top-notch medical care in Sewickley, PA. Conveniently located at 1106 Ohio River Blvd STE 602, our facility offers comprehensive healthcare services designed to address your urgent medical needs with efficiency and compassion. At Royal Treatment Urgent Med Cr, we pride ourselves on delivering exceptional patient care through our team of highly skilled and experienced doctors and healthcare professionals. Our modern clinic is equipped with state-of-the-art medical technology, ensuring accurate diagnostics and effective treatments for a wide range of health concerns.
Absolute Primary Care-UPMC
Absolute Primary Care-UPMC, located at 20630 Rte 19 Suite 101, Cranberry Township, PA 16066, is a premier healthcare facility dedicated to providing comprehensive primary care services to the local community. As part of the renowned UPMC network, this practice offers a range of medical services designed to address the diverse health needs of patients of all ages. At Absolute Primary Care-UPMC, patients can expect to receive personalized and compassionate care from experienced and highly qualified doctors and healthcare professionals. The clinic specializes in preventive care, routine check-ups, chronic disease management, and treatment of acute illnesses. By focusing on holistic and patient-centered approaches, the team ensures that every individual receives the highest quality of care tailored to their unique health concerns.
Fresenius Medical Care: Lawlor Maureen MD
Fresenius Medical Care: Lawlor Maureen MD is a distinguished medical practice located at 1407 Woodside Ave, Ellwood City, PA 16117, United States. Specializing in comprehensive healthcare services, this practice is dedicated to providing high-quality medical care to its patients. Dr. Maureen Lawlor, a highly qualified and compassionate physician, leads the clinic with a focus on delivering personalized and attentive care. The facility is equipped with modern medical technologies and resources to ensure accurate diagnoses and effective treatments. Whether you require routine check-ups, specialized medical advice, or ongoing health management, Fresenius Medical Care: Lawlor Maureen MD is committed to supporting your health and well-being with professionalism and compassion.
Robinson Township Urgent Care Center
Robinson Township Urgent Care Center, located in Robinson Township, PA 15136, is a premier healthcare facility dedicated to providing immediate, high-quality medical care for non-life-threatening conditions. Our center is staffed with a team of experienced healthcare professionals, including board-certified physicians, nurse practitioners, and medical assistants, who are committed to delivering compassionate and efficient care. We offer a wide range of services, including treatment for minor injuries, illnesses, and infections, as well as diagnostic services such as X-rays and lab tests. With state-of-the-art equipment and a patient-centered approach, we ensure that each individual receives timely and effective treatment tailored to their specific needs.
Family Health Care of Edinboro
Family Health Care of Edinboro is dedicated to providing exceptional primary care, internal medicine, and a variety of additional health services to the residents of Erie County and its neighboring areas. Conveniently located at 120 Washington Towne Blvd in Edinboro, PA, our practice is committed to delivering high-quality medical care in a comfortable and welcoming environment for your entire family.
AHN Primary Care Pittsburgh
AHN Primary Care Pittsburgh is a reputable healthcare facility dedicated to providing comprehensive primary care services to the community. Conveniently located at 12311 Perry Hwy Suite 2, Wexford, PA 15090, this clinic is easily accessible for residents in and around the Pittsburgh area. As part of the Allegheny Health Network, the clinic prides itself on offering personalized, patient-centered care that caters to the unique needs of each individual. The team at AHN Primary Care Pittsburgh consists of experienced and compassionate healthcare professionals, including board-certified physicians, nurse practitioners, and support staff, all committed to promoting overall health and well-being. They offer a wide range of services, from routine check-ups and preventive care to chronic disease management and acute illness treatment.
Geisinger Careworks Urgent Care
Geisinger Careworks Urgent Care is a trusted healthcare facility located at 224 N Logan Blvd #220, Burnham, PA 17009, United States. Specializing in providing immediate medical attention for non-life-threatening conditions, this urgent care center offers a convenient and reliable option for patients in need of prompt care. The professional and compassionate staff are dedicated to delivering high-quality medical services, including treatment for minor injuries and illnesses, diagnostic testing, and preventive care. Open daily with extended hours, Geisinger Careworks Urgent Care ensures that you and your family receive timely and efficient medical attention when you need it most.
UPMC Urgent Care in Lancaster
UPMC Urgent Care in Lancaster is a trusted walk-in center located at 233 College Ave Suite 101, Lancaster, PA 17603, United States. This health facility, formerly known as UPMC Express Care, is dedicated to providing quality medical care for patients experiencing minor illnesses and injuries. In addition to urgent care services, UPMC Urgent Care offers a comprehensive range of medical services including lab and imaging services, physicals, vaccinations and flu shots, pregnancy testing, and occupational health services. This ensures that patients receive timely and efficient care for a variety of health needs.
Punsxutawney Area Hospital Draw Station Lab
Punxsutawney Area Hospital Draw Station Lab, located at 200 Prushnok Dr, Punxsutawney, PA 15767, is a vital healthcare facility dedicated to providing high-quality laboratory services to the local community. As an extension of the Punxsutawney Area Hospital, this draw station lab specializes in collecting blood and other specimens for a wide range of diagnostic tests. With a commitment to accuracy, efficiency, and patient care, the lab is staffed by experienced phlebotomists and lab technicians who ensure that each patient’s experience is as comfortable and seamless as possible. The facility is equipped with state-of-the-art technology to support timely and precise test results, aiding in the effective diagnosis and treatment of various medical conditions.
AHN Express Care
AHN Express Care, located at 1 Kensington Square Suite B, New Kensington, PA 15068, is your go-to destination for prompt and professional healthcare services. As part of the esteemed Allegheny Health Network, AHN Express Care specializes in providing immediate medical attention for non-life-threatening conditions, ensuring that you receive the care you need without the long wait times often associated with emergency rooms. Our skilled healthcare professionals are dedicated to delivering high-quality care in a welcoming and compassionate environment. Whether you're dealing with minor injuries, illnesses, or require routine medical services such as vaccinations and physical exams, AHN Express Care is equipped to meet your needs efficiently and effectively.
MedExpress Urgent Care
MedExpress Urgent Care, located at 1613 N Atherton St Suite B, State College, PA 16803, is a premier healthcare facility dedicated to providing high-quality urgent care services to the local community. Specializing in a wide range of health services, MedExpress offers convenient, walk-in care for illnesses and injuries, routine check-ups, lab testing, and more. The experienced medical staff is committed to delivering compassionate care with minimal wait times, ensuring that patients receive timely and effective treatment. Whether you need immediate attention for a minor emergency or are seeking general medical advice, MedExpress Urgent Care is your go-to destination for reliable and professional healthcare services in State College.
Urgent Care At AGH Suburban
Urgent Care At AGH Suburban, located at 100 S Jackson Ave, Pittsburgh, PA 15202, is a premier healthcare facility dedicated to providing immediate and high-quality medical care to the local community. Specializing in urgent care services, the clinic is staffed with experienced healthcare professionals who are equipped to handle a wide range of non-life-threatening medical conditions. Whether you are dealing with minor injuries, illnesses, or require diagnostic services such as X-rays and lab tests, Urgent Care At AGH Suburban ensures you receive prompt and efficient treatment. The facility is committed to offering convenient and compassionate care, making it a trusted choice for those in need of timely medical attention.
Wayne Memorial Hospital Lab
Welcome to Wayne Memorial Hospital Lab, a trusted healthcare facility located at 543 Easton Turnpike, Lake Ariel, Pennsylvania. Committed to providing top-notch medical laboratory services, our lab is an integral part of the Wayne Memorial Hospital network, ensuring that our community receives accurate and timely diagnostic results. Our state-of-the-art facility is staffed by a team of experienced and dedicated professionals who prioritize patient care and safety. Whether you require routine blood work, specialized testing, or urgent diagnostics, our lab is equipped to meet your needs with precision and care. At Wayne Memorial Hospital Lab, we strive to support your health journey with the highest standards of medical excellence and compassionate service. Visit us to experience healthcare you can trust.
Saint Mary Urgent Care
Welcome to Saint Mary Urgent Care, your trusted healthcare provider in Levittown, Pennsylvania. Conveniently located at 4525 New Falls Road, we are dedicated to offering prompt, professional, and compassionate care to meet the urgent medical needs of our community. At Saint Mary Urgent Care, we understand that health issues can arise unexpectedly, which is why we provide a wide range of services without the need for an appointment. Our team of experienced healthcare professionals is equipped to handle non-life-threatening conditions with efficiency and care. Whether you're dealing with minor injuries, illnesses, or require diagnostic services like X-rays and lab tests, we are here to assist you.
Urgent Care at Northeast Philadelphia
Welcome to Urgent Care at Northeast Philadelphia, your trusted healthcare provider located at 2900 Cottman Avenue, Philadelphia, Pennsylvania 19149. We are dedicated to offering prompt and professional medical services to our community, ensuring that you receive the care you need when you need it most. Our facility is equipped with state-of-the-art medical technology and staffed by experienced healthcare professionals who are committed to delivering compassionate and efficient care. Whether you are dealing with a minor injury, illness, or require diagnostic services, our team is here to assist you with minimal wait times and no appointments necessary. At Urgent Care at Northeast Philadelphia, your health and well-being are our top priorities. Visit us today and experience the difference in quality healthcare that is both accessible and affordable.
WHS Washington Hospital Emergency Room
WHS Washington Hospital Emergency Room is a leading healthcare institution located at 155 Wilson Avenue in Washington, Pennsylvania, United States. Our state-of-the-art emergency room is dedicated to providing top-quality medical care to patients in need of urgent treatment. Our team of highly skilled and experienced healthcare professionals is available 24/7 to ensure prompt and efficient care for all patients. With a commitment to excellence and compassion, WHS Washington Hospital Emergency Room is here to serve the community and provide the highest standard of emergency medical care.
WHS Diagnostics - Greene
WHS Diagnostics - Greene is a leading health institution located at 350 Bonar Avenue in Waynesburg, Pennsylvania, United States. Our dedicated team of healthcare professionals offers a wide range of diagnostic services to help patients receive accurate and timely medical assessments. With state-of-the-art technology and a commitment to quality care, we strive to provide the highest standard of diagnostic services to our community. Visit us today to experience personalized and efficient healthcare services at WHS Diagnostics - Greene.
WHS Occupational Medicine - Waynesburg
WHS Occupational Medicine in Waynesburg is a leading health institution located at 220 Greene Plaza in Waynesburg, Pennsylvania, United States. Specializing in occupational medicine, this facility provides comprehensive healthcare services to individuals in the workforce. With a team of experienced medical professionals, WHS Occupational Medicine is dedicated to promoting the health and well-being of employees through preventative care, injury treatment, and wellness programs. Whether you are seeking medical clearance for a new job or require treatment for a work-related injury, WHS Occupational Medicine is committed to providing high-quality care tailored to meet the unique needs of each patient.
Healogics, LLC
Healogics, LLC is a leading healthcare institution located at 1000 Dutch Ridge Road in Beaver, Pennsylvania, United States. Specializing in wound care management, Healogics is dedicated to providing innovative and effective treatment options for patients with chronic wounds. With a team of skilled healthcare professionals and state-of-the-art technology, Healogics strives to improve the quality of life for individuals suffering from a variety of wound-related conditions. Whether you are seeking treatment for diabetic ulcers, pressure sores, or other chronic wounds, Healogics is committed to delivering personalized care and support to help you heal and thrive.
Healogics, LLC
Healogics, LLC is a leading healthcare institution located at 5515 Peach Street in Erie, Pennsylvania, United States. Specializing in wound care management, Healogics offers advanced treatments and therapies for patients with chronic wounds and ulcers. With a team of experienced healthcare professionals, Healogics is dedicated to providing personalized care and innovative solutions to help patients heal and improve their quality of life. Whether you are dealing with a diabetic ulcer, pressure sore, or other wound-related issues, Healogics is committed to delivering exceptional care and positive outcomes for all patients.
Penn Highlands Family Medicine
Penn Highlands Family Medicine is a trusted medical institution located at 5 North 3rd Street in Reynoldsville, Pennsylvania. Our team of dedicated doctors and health professionals are committed to providing high-quality primary care services to patients of all ages. Whether you need a routine check-up, treatment for an illness, or management of a chronic condition, our compassionate staff is here to help. At Penn Highlands Family Medicine, we prioritize the health and well-being of our patients, offering personalized care in a welcoming and comfortable environment. Schedule an appointment with us today and experience the difference that quality family medicine can make in your life.
Geisinger ConvenientCare South Abington
Geisinger ConvenientCare South Abington is a healthcare institution situated at 631 Northern Boulevard in Pennsylvania, United States. This facility offers convenient and accessible healthcare services for a wide range of medical needs. From minor illnesses and injuries to routine check-ups and vaccinations, Geisinger ConvenientCare South Abington provides quality care in a convenient location. With expert medical staff and state-of-the-art facilities, patients can expect personalized care and quick treatment for their healthcare needs. Whether you are seeking treatment for a cold, flu, or other minor ailment, Geisinger ConvenientCare South Abington is here to provide efficient and reliable healthcare services.
Geisinger Nanticoke
Geisinger Nanticoke is a leading healthcare institution located at 128 East Main Street in Nanticoke, Pennsylvania, United States. As a trusted provider of health services, Geisinger Nanticoke is committed to delivering high-quality care to patients in the Nanticoke community and beyond. With a team of skilled healthcare professionals and state-of-the-art facilities, Geisinger Nanticoke offers a wide range of medical services to meet the diverse needs of its patients. Whether you are in need of routine medical care, specialized treatment, or emergency services, you can trust Geisinger Nanticoke to provide compassionate and comprehensive care for all your healthcare needs.
PMC - West End Healthcare Center
PMC - West End Healthcare Center is a leading healthcare institution located in Brodheadsville, Pennsylvania. With a commitment to providing high-quality medical care to the community, our center offers a wide range of healthcare services to patients of all ages. From primary care and preventive medicine to specialty services and rehabilitation therapies, our dedicated team of healthcare professionals is here to ensure the well-being of our patients. Conveniently located at 120 Burrus Boulevard, PMC - West End Healthcare Center is your trusted partner in health and wellness.
UPMC Pinecrest Family Practice – French Street
UPMC Pinecrest Family Practice – French Street, located at 3125 French Street in Erie, Pennsylvania, offers primary and internal medicine care to residents of Erie County and nearby regions. With a team of dedicated doctors and staff, you can expect high-quality care in a comfortable environment for your entire family. Choose UPMC Pinecrest Family Practice – French Street for all your healthcare needs. Access your health information easily through the MyUPMC portal. For patients of UPMC-affiliated doctors in Central Pa, there is the UPMC Central Pa Portal. Patients of UPMC Cole receiving inpatient care should select the UPMC Cole Connect Patient Portal. Trust UPMC Pinecrest Family Practice – French Street for exceptional medical care.
Greater Pittsburgh Medical Associates-UPMC
Greater Pittsburgh Medical Associates-UPMC, located at 20130 Route 19 in Cranberry Township, Pennsylvania, is a trusted institution offering primary care services. With a focus on providing reliable and compassionate healthcare, our team of doctors is dedicated to helping patients take the first step towards a healthier future. Patients can easily access their health information through the MyUPMC portal, ensuring that their medical records are always at their fingertips. For those in need of quality healthcare in the Cranberry Township area, Greater Pittsburgh Medical Associates-UPMC is the ideal choice. Schedule an appointment today and experience the difference in care that our institution provides.
People also searched for:
- Urgent care with lab in Abington
- Urgent care with lab in Aliquippa
- Urgent care with lab in Allentown
- Urgent care with lab in Ambridge
- Urgent care with lab in Aston
- Urgent care with lab in Baden
- Urgent care with lab in Bala Cynwyd
- Urgent care with lab in Beaver
- Urgent care with lab in Beaver Falls
- Urgent care with lab in Belle Vernon
- Urgent care with lab in Bellevue
- Urgent care with lab in Bensalem
- Urgent care with lab in Bethel Park
- Urgent care with lab in Bethlehem
- Urgent care with lab in Boyertown
- Urgent care with lab in Bradford
- Urgent care with lab in Bridgeville
- Urgent care with lab in Brodheadsville
- Urgent care with lab in Bryn Mawr
- Urgent care with lab in Burgettstown
- Urgent care with lab in Butler
- Urgent care with lab in Canonsburg
- Urgent care with lab in Carmichaels
- Urgent care with lab in Carnot-Moon
- Urgent care with lab in Chambersburg
- Urgent care with lab in Clairton
- Urgent care with lab in Clarion
- Urgent care with lab in Conneaut Lake
- Urgent care with lab in Connellsville
- Urgent care with lab in Coraopolis
- Urgent care with lab in Cranberry Township
- Urgent care with lab in Dingmans Ferry
- Urgent care with lab in Downingtown
- Urgent care with lab in Doylestown
- Urgent care with lab in Drexel Hill
- Urgent care with lab in Dunmore
- Urgent care with lab in East Norriton
- Urgent care with lab in East Stroudsburg
- Urgent care with lab in Easton
- Urgent care with lab in Edinboro
- Urgent care with lab in Elkins Park
- Urgent care with lab in Ellwood City
- Urgent care with lab in Erie
- Urgent care with lab in Evans City
- Urgent care with lab in Exton
- Urgent care with lab in Fairless Hills
- Urgent care with lab in Fairview
- Urgent care with lab in Farrell
- Urgent care with lab in Franklin
- Urgent care with lab in Glen Mills
- Urgent care with lab in Greensburg
- Urgent care with lab in Greenville
- Urgent care with lab in Grove City
- Urgent care with lab in Hampton Township
- Urgent care with lab in Hanover
- Urgent care with lab in Harmony
- Urgent care with lab in Hermitage
- Urgent care with lab in Honesdale
- Urgent care with lab in Horsham
- Urgent care with lab in Imperial
- Urgent care with lab in Indiana
- Urgent care with lab in Jefferson Hills
- Urgent care with lab in Jenkintown
- Urgent care with lab in Jim Thorpe
- Urgent care with lab in Johnstown
- Urgent care with lab in Kennett Square
- Urgent care with lab in King of Prussia
- Urgent care with lab in Kingston
- Urgent care with lab in Kutztown
- Urgent care with lab in Lake Ariel
- Urgent care with lab in Lancaster
- Urgent care with lab in Langhorne
- Urgent care with lab in Lansdale
- Urgent care with lab in Latrobe
- Urgent care with lab in Lehighton
- Urgent care with lab in Levittown
- Urgent care with lab in Linesville
- Urgent care with lab in Malvern
- Urgent care with lab in Mars
- Urgent care with lab in McKees Rocks
- Urgent care with lab in McKeesport
- Urgent care with lab in McMurray
- Urgent care with lab in Meadville
- Urgent care with lab in Mercer
- Urgent care with lab in Milford
- Urgent care with lab in Monaca
- Urgent care with lab in Monongahela
- Urgent care with lab in Monroeville
- Urgent care with lab in Moosic
- Urgent care with lab in Mount Lebanon
- Urgent care with lab in Mount Pleasant
- Urgent care with lab in Murrysville
- Urgent care with lab in Nazareth
- Urgent care with lab in New Brighton
- Urgent care with lab in New Castle
- Urgent care with lab in New Kensington
- Urgent care with lab in New Wilmington
- Urgent care with lab in Newtown
- Urgent care with lab in Norristown
- Urgent care with lab in North East
- Urgent care with lab in North Wales
- Urgent care with lab in Paoli
- Urgent care with lab in Philadelphia
- Urgent care with lab in Phoenixville
- Urgent care with lab in Pittsburgh
- Urgent care with lab in Plymouth Meeting
- Urgent care with lab in Pottstown
- Urgent care with lab in Punxsutawney
- Urgent care with lab in Reading
- Urgent care with lab in Richboro
- Urgent care with lab in Rochester
- Urgent care with lab in Royersford
- Urgent care with lab in Saegertown
- Urgent care with lab in Scranton
- Urgent care with lab in Sellersville
- Urgent care with lab in Seven Fields
- Urgent care with lab in Sewickley
- Urgent care with lab in Sharon
- Urgent care with lab in Slippery Rock
- Urgent care with lab in Springfield
- Urgent care with lab in Stroudsburg
- Urgent care with lab in Tamaqua
- Urgent care with lab in Tarentum
- Urgent care with lab in Titusville
- Urgent care with lab in Tobyhanna
- Urgent care with lab in Uniontown
- Urgent care with lab in Warminster
- Urgent care with lab in Washington
- Urgent care with lab in Waterford
- Urgent care with lab in Waynesburg
- Urgent care with lab in West Chester
- Urgent care with lab in West Grove
- Urgent care with lab in West Mifflin
- Urgent care with lab in Wexford
- Urgent care with lab in Whitehall
- Urgent care with lab in Wilkes-Barre
- Urgent care with lab in Wilkes-Barre Township
- Urgent care with lab in Wyomissing
- Urgent care with lab in York
- Urgent care with lab in Zelienople
People also searched for:
List of local businesses, places and services in Pennsylvania
⭐ business help 🔍 services ☎ phones 🕒 opening times ✍️reviews 🌍 addresses, locations 📷 photos