Fibrinogen (Serum) Concentration

What Is Fibrinogen?

Fibrinogen is a natural protein produced by your liver. It’s essential for blood clotting, helping to stop bleeding when you get injured. Low levels can increase your risk of bleeding too easily, while high levels may raise the risk of blood clots. This test helps doctors assess your clotting ability and overall blood health.

Why Might You Need This Test?

Your doctor may order a serum fibrinogen test if you have symptoms like easy bruising, excessive bleeding, or a history of clotting problems. It’s also used in monitoring conditions like liver disease, kidney disease, or after surgeries or medical treatments that affect blood clotting.

How Is the Test Done?

A small blood sample is taken from a vein, usually in your arm. The blood is then sent to a lab to measure fibrinogen levels. No special preparation is usually needed, but you may be asked to avoid certain medications or activities for a few days before testing.

What Do the Results Mean?

Results are reported as a concentration value (e.g., grams per liter). While reference ranges vary by lab, very low levels may suggest bleeding disorders or liver issues, while very high levels could indicate inflammation, infection, or clotting disorders. Your doctor will interpret results in the context of your overall health.