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Individual test · Labcorp 164519

Protein S, Free

This test measures the amount of free Protein S in your blood, a protein that helps prevent excessive blood clotting. It helps show whether you have enough active Protein S to stop clots from forming when they are not needed. Doctors use this measurement to evaluate the cause of unexplained blood clots or to check for an inherited clotting disorder. However, this test cannot diagnose a current blood clot or identify other reasons for clotting problems on its own.

How ordering works

  1. 1

    Review the order and pay on Picardo. Your account is set up as you check out.

  2. 2

    A licensed physician reviews the order and decides whether to authorize it.

  3. 3

    Give blood at a Labcorp location, or book an at-home draw for $75.00.

  4. 4

    Your results arrive in your Picardo account.

For adults 18+ in the US. Lab orders aren’t available in New York, New Jersey, Rhode Island, Pennsylvania, Maryland, Massachusetts, Hawaii or Maine.