Fibrinogen (Serum) with Visual Inspection for Fibrin Clot Formation

What Does This Test Measure?

Fibrinogen is a protein produced by your liver that plays a key role in blood clotting. When blood is drawn, it separates into plasma (liquid) and cells. This test checks two things: the amount of fibrinogen in your serum (the liquid part of blood after clotting) and whether a clot forms visibly when the sample is left undisturbed.

Why Might You Need This Test?

Doctors may order this test to evaluate bleeding disorders (like hemophilia), clotting disorders (like deep vein thrombosis), or to monitor treatments that affect clotting, such as anticoagulants. It can also help diagnose conditions like liver disease, which can reduce fibrinogen levels.

How Is the Test Done?

A blood sample is drawn from a vein, usually in your arm. The blood is placed in a tube without an anticoagulant (to allow clotting). After a short time, the sample is examined for clot formation and fibrinogen concentration in the serum.

What Do the Results Mean?

Results are reported as a ratio (e.g., clot time vs. fibrinogen level) or qualitative (normal, decreased, or increased). Low fibrinogen may indicate bleeding risks, while high levels could suggest inflammation or clotting disorders. Your doctor will interpret results in the context of your health and symptoms.