CPT® Code 85385

The CPT® Code 85385 refers to a laboratory test that measures fibrinogen antigen levels in the blood. Fibrinogen is a crucial protein involved in the coagulation process, specifically classified as coagulation factor I, which is synthesized in the liver. This protein plays a vital role in hemostasis, the process that prevents and stops bleeding. During the clotting cascade, fibrinogen is converted from its soluble form into insoluble fibrin threads, which weave together to form a stable clot at the site of vascular injury, effectively halting blood loss. The fibrinogen antigen test (CPT® Code 85385) quantifies the amount of fibrinogen present in the bloodstream, providing essential information about the body’s ability to form clots. This test is often performed alongside the fibrinogen activity test (CPT® Code 85384), which assesses the functional capacity of the fibrinogen present. Together, these tests are instrumental in diagnosing and monitoring conditions associated with abnormal bleeding or clotting, such as unexplained bleeding episodes, prolonged bleeding times in tests like prothrombin time (PT) and activated partial thromboplastin time (PTT), and hereditary fibrinogen deficiencies. Additionally, they may be utilized to evaluate an individual's risk for cardiovascular diseases. The sample for this test is typically obtained through venipuncture, and the analysis is conducted on platelet-poor plasma using advanced techniques such as electromagnetic mechanical clot detection.