Fibrinogen Heparin Adsorbed

This test measures the amount of fibrinogen in your blood plasma after the laboratory removes heparin from the sample. Fibrinogen is a protein that your body converts to fibrin to form stable blood clots and stop bleeding.

Heparin, a common blood thinner and catheter flush, can interfere with routine clot-based fibrinogen assays. By adsorbing heparin before testing, this method provides a truer estimate of your fibrinogen level when standard testing would otherwise be affected by heparin.

Your care team may order this test if you are receiving heparin therapy, if blood was drawn from a line that was flushed with heparin, or if there is concern that heparin is distorting coagulation results. It helps evaluate bleeding, easy bruising, or clotting problems, and can support care in conditions that consume fibrinogen or reduce its production.

Results can inform decisions around surgery or procedures, intensive care monitoring, and the need for treatments such as cryoprecipitate or fibrinogen concentrate. Removing heparin from the sample helps distinguish a true fibrinogen issue from medication effects or sample contamination.

A lower-than-expected result can be due to increased use of fibrinogen in your body, reduced production by the liver, inherited deficiency, or dilution from fluids or transfusion. A higher-than-expected result often reflects inflammation, tissue injury, or hormonal changes. Your result is interpreted alongside other tests and your symptoms, not in isolation.

Because this method neutralizes heparin, unexpected findings may prompt your clinician to review how and when the sample was collected, the timing of your last heparin dose, and other medicines that affect clotting. If needed, the test may be repeated or a different method may be used. Any next steps will be based on your overall clinical situation.