RT Book, Section A1 Lichtman, Marshall A. A1 Kaushansky, Kenneth A1 Prchal, Josef T. A1 Levi, Marcel M. A1 Burns, Linda J. A1 Armitage, James O. SR Print(0) ID 1133366048 T1 Hereditary Disorders of Fibrinogen T2 Williams Manual of Hematology, 9e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781259642470 LK hemonc.mhmedical.com/content.aspx?aid=1133366048 RD 2024/04/19 AB Quantitative disorders of fibrinogen may be afibrinogenemia or hypofibrinogenemia, depending on the severity.Normal fibrinogen levels range from 150 to 350 mg/dL. In afibrinogenemia, the fibrinogen concentration is less than 20 mg/dL. In hypofibrinogenemia, the level is less than normal.Approximately 100 distinct mutations have been identified in patients with afibrinogenemia (in homozygosity or in compound heterozygosity) or in hypofibrinogenemia. Causative mutations can be divided into two main classes: null mutations with no protein production at all and mutations producing abnormal protein chains that are retained inside the cell.