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The Protein S Test checks the level and function of protein S, a natural protein that helps prevent unwanted blood clots. It may also be called a protein S activity test or protein S antigen test. If your provider ordered it, you can book at participating labs on LabFinder.
This test can also appear as a protein S functional assay. It shows how much protein S you have and how well it works to control clotting. Low or not working protein S can raise the risk of forming clots.
Common reasons: a history of blood clots in the legs or lungs, a clot at a young age, clots in unusual places, repeat pregnancy loss, or a strong family history of clotting problems. Your doctor may also order it if other clotting tests were not clear and they want a fuller picture.
You will check in, show your ID and lab order, and have a short review of medicines. A phlebotomist will clean your arm and draw a small tube of blood. A bandage is placed and you can leave. Plan for about 15 to 30 minutes at the site, including waiting.
Yes, this is a quick, routine blood draw and is considered very safe. You might feel a quick pinch, notice a small bruise, or feel a little lightheaded for a moment afterward, but those effects usually fade quickly. Be sure to tell the staff if you take blood thinners, have a bleeding disorder, or if you have fainted during blood draws before. They will take extra care to keep you comfortable. Let the team know if you are on warfarin or are pregnant, since timing can affect results.
Medications: bring a list and tell the staff if you use warfarin or other blood thinners. Illness: try to schedule when you are not acutely sick, as infections can change levels. Food and drink: fasting is not usually needed unless your doctor says so. Hydration: drink water before your visit to help with the draw. Always follow your doctor’s instructions and bring any past clotting test results if you have them.
Unexplained deep vein thrombosis, pulmonary embolism, clots in unusual areas like the abdominal veins, stroke at a young age, repeat miscarriage related to clotting, and inherited thrombophilia in families. Results are read in context. Your doctor will review them with your history and symptoms before advising next steps.
You can compare locations, see time slots, and book online at participating labs. It is easy to search for a convenient location in your area or by city or ZIP. Coverage varies by plan and provider, so please confirm benefits and any out of pocket costs when you book.
Book on LabFinder: find a lab today on our lab finder and request a test doctor guided.
The information on this page and throughout the LabFinder website and mobile app is for general informational purposes only. It is not intended to serve as medical advice, diagnosis, or treatment. For personalized medical advice or specific health concerns, please consult your healthcare provider directly.
Booking a Protein S Test is easy using LabFinder. Just choose your location and enter your insurance information to find the closest Protein S Test near you.
To make a same-day appointment for a Protein S Test, just choose your location and your insurance information to find the closest Protein S Test location near you. If there's availability for a same-day appointment at a nearby lab location, then you will be able to book it easily through LabFinder.
LabFinder allows you to easily schedule a Protein S Test. You can search by location and insurance to easily book a Protein S Test near you.
LabFinder allows you to easily make an appointment for a Protein S Test online. To make an appointment for a Protein S Test online, just choose your location and your insurance information to find the closest Protein S Test near you.
Yes, you can get a Protein S Test without insurance. LabFinder allows you to search and select "Self-Pay" when booking a Protein S Test. While pricing for the test may not be immediately available, please check by calling the lab company directly for pricing.
