Dic Score Calculator

Disseminated intravascular coagulation is not a disease but a systemic failure mode of hemostasis in which unregulated thrombin generation deposits fibrin in the microvasculature while simultaneously exhausting platelets and clotting factors. The ISTH algorithm converts that pathophysiology into four measurable consequences: consumption of platelets, generation and lysis of fibrin (D-dimer or fibrin degradation products), depletion of factors reflected in prothrombin time prolongation, and depletion of the substrate itself as fibrinogen. The weightings are deliberately uneven. Fibrin markers carry up to 3 points because ongoing fibrin turnover is the most specific evidence of the process, while fibrinogen carries only 1 because it behaves poorly as a marker. Operating thresholds are fixed: platelets above 100,000 per microliter score 0, 50,000 to 100,000 score 1, below 50,000 score 2; PT prolonged 3 to 6 seconds scores 1 and beyond 6 seconds scores 2; fibrinogen below 100 mg/dL scores 1. A total of 5 or more on the 8-point scale is compatible with overt DIC. The score is only valid when an underlying trigger such as sepsis, trauma, obstetric catastrophe or malignancy is present, and it fails in predictable ways. Fibrinogen is an acute phase reactant that can sit above 300 mg/dL in septic DIC despite heavy consumption; D-dimer is elevated after any surgery, thromboembolism or pregnancy; and advanced liver disease reproduces the platelet and PT abnormalities without DIC.

Formal criteria for DIC emerged first in Japan, where the Ministry of Health and Welfare issued a diagnostic scoring system in 1983 that combined laboratory values with clinical bleeding and organ symptoms. That system was widely used in Japanese practice but was criticized for detecting DIC late, and it did not translate readily to other health systems. Through the 1990s the absence of an internationally agreed definition made trials of DIC therapies almost impossible to compare, because each study enrolled a differently defined population. The Scientific and Standardization Committee on DIC of the International Society on Thrombosis and Haemostasis addressed this directly, and the resulting proposal by Taylor and colleagues was published in Thrombosis and Haemostasis in 2001. It deliberately used only tests available in any hospital laboratory, separated overt from non-overt DIC, and mandated a repeat calculation rather than a single snapshot. Subsequent validation work found the 5-point threshold to be highly specific for overt DIC when applied to patients with a recognized underlying disorder. The Japanese Association for Acute Medicine published an alternative, more sensitive score aimed at earlier sepsis-associated coagulopathy in 2006. British Committee for Standards in Haematology guidance authored by Levi and colleagues in 2009, and a harmonization statement led by Wada in 2013 reconciling the ISTH, Japanese and British recommendations, established the ISTH score as the common reference standard.