Protein C and Protein S

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Formal name: Protein C Functional or Antigen; Protein S Free (Functional) or Antigen (Total)

At a Glance

Why Get Tested?

To help evaluate a thrombotic episode, to determine whether you may have an inherited or acquired Protein C or Protein S deficiency

When to Get Tested?

When you have had an unexplained thromboembolism (a blood vessel blocked by a blood clot), when your newborn has a severe clotting disorder, such as disseminated intravascular coagulation (DIC) or purpura fulminans. Sometimes when a close relative has an inherited Protein C or Protein S deficiency

Sample Required?

A blood sample taken from a vein in your arm

Test Preparation Needed?

No test preparation is needed.