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Hereditary dysfibrinogenemia is a rare clotting disorder due to a structural defect in the fibrinogen molecule that results in a tendency for bleeding and thrombosis, as well as obstetric complications. We describe the laboratory results and clinical manifestations for 50 patients with a diagnosis of dysfibrinogenemia. Various different laboratory measurements of fibrinogen were performed on samples from these patients, including fibrinogen (Clauss), heat fibrinogen precipitation according to Schulz and immunological fibrinogen. Fifty patients were found with dysfibrinogenemia (52% female; median age 52, range 9–89 years). The fibrinogen level according to Clauss was low, with a median of 51 mg/dL (range 15–86 mg/dL; normal range 150–450 mg/dL). Determination of other fibrinogen levels revealed normal results: heat fibrinogen precipitation according to Schulz, 240 mg/dL; and immunological fibrinogen, 244 mg/dL. The median reptilase time was longer than normal, at 55 s (normal 20 s). Some 50% of the patients reported a distinct bleeding tendency, mostly a tendency for hematoma (60%) and secondary bleeding (44%). Thirteen patients had thrombotic events, of which 54% were located arterially. Some 12% of the patients reported a tendency for bleeding and for thrombosis, whereas 19% had miscarriages, sometimes recurrent. We found that functional fibrinogen levels (Clauss) were generally lower in patients with bleeding manifestations (43 vs. 57 mg/dL in other patients).

laboratoriumsmedizin

Laboratory diagnosis and clinical manifestations of patients with dysfibrinogenemia / Laboratoriumsdiagnostik und klinische Manifestation der Dysfribrinogenämie