Serum or Plasma Substance Concentration (Mass) – Vitamin K-dependent clotting factors (e.g., factors II, VII, IX, X)

What This Test Measures

This test checks levels of specific blood proteins (such as factors II, VII, IX, and X) that are essential for normal blood clotting. These proteins require vitamin K to work correctly. The test may be ordered to evaluate bleeding disorders, monitor vitamin K levels, or check for liver disease.

Why It’s Ordered

Your doctor may recommend this test if you have symptoms of bleeding problems (like excessive bruising or nosebleeds), if you’re taking medications that affect blood clotting, or if you have conditions like liver disease or vitamin K deficiency. It can also be used to monitor treatment for bleeding disorders.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your arm to draw blood. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Lower-than-normal levels may suggest bleeding disorders, liver disease, or vitamin K deficiency. Higher-than-normal levels might indicate conditions like liver disease or certain medications. Your doctor will interpret results in the context of your overall health.