Quick Reference
- Full form
- Protein S
- Sample type
- Blood
- Fasting
- Not required
- Marker measured
- 1
- Report turnaround
- Same day
- Available at
- All locations
About Protein S
Protein S works alongside Protein C as a natural anticoagulant, and testing both together gives a fuller picture when investigating unexplained clotting events.
No fasting is required, and results are available the same day.
How to Prepare
- No fasting required.
- No special preparation needed before your blood draw.
Frequently Asked Questions
What does Protein S testing check for?
It checks levels of another natural anticoagulant, working alongside Protein C to prevent excess clotting.
Do I need to fast before this test?
No fasting is required.
Is this tested alone or with Protein C?
Both are typically tested together as part of a clotting risk workup.
When would my doctor order this test?
Typically after an unexplained blood clot or with a family history of clotting disorders.
How soon will my report be ready?
Same day.
Is home sample collection available?
Yes, in all City Care Lab service areas.
This page provides general health information and is not a substitute for medical advice. Speak with your doctor about your specific results and treatment.