Protein S

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Overview of PROTEIN S TEST

Protein S is an anticoagulant protein in the blood which helps blood to clot normally. Protein S test is done when there is improper blood clot formation.


Protein S test is a blood test done to test for the deficiency of Protein S. Protein S helps control blood clot formation, when there is a deficiency of Protein S there is excessive clotting. Protein S test helps in the diagnosis of blood clot formation related disorders.

Why is PROTEIN S TEST suggested?

Protein S Test is suggested for the following reasons:

  • Inherited Protein S deficiency runs in the family.
  • A newborn has a clotting disorder.
  • The patient had a blood clot.
  • Repeated miscarriages

How is PROTEIN S TEST performed?

Protein S test is performed as follows:

  • Blood is withdrawn from a vein in the forearm.
  • The site of blood withdrawal is covered with a band-aid.

The result of the Protein S test is received within 24-48 hours.

What are the parameters measured in PROTEIN S TEST?

Protein S test measures the amount of Protein S present in the blood. Decreased levels of Protein S warrants further professional consultation.

Preparation before performing PROTEIN S TEST

Preparation before performing the Protein S Test involves:

  • Wait ten days after the thrombotic episode.
  • Do not consume oral warfarin or other blood thinners two-three weeks before the test.
  • Do not consume birth control pills.

Post-care after PROTEIN S TEST

Post-care not required after performing the Protein S Test.

Sample types in PROTEIN S TEST

Sample type in Protein S Test are:

  • 3 ml of whole blood.

Side effects/risks of PROTEIN S TEST

There are no major side effects associated with Protein S test, one might experience slight pain at the location of blood withdrawal but that will go away quickly.

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