DIC Syndrome
Assess overt DIC risk using the ISTH scoring system. Enter platelet count, D-dimer, PT prolongation, and fibrinogen for a probability score and interpretation.
About This Calculator
The DIC Syndrome Calculator uses the International Society on Thrombosis and Haemostasis (ISTH) scoring system to assess the probability of overt disseminated intravascular coagulation (DIC). DIC is a complex and life-threatening condition where systemic activation of coagulation pathways leads to simultaneous thrombosis and bleeding, consuming clotting factors and platelets throughout the body.
This clinical tool is designed for healthcare professionals — physicians, hematologists, intensive care specialists, and emergency medicine practitioners — to quickly and consistently evaluate four key laboratory parameters: platelet count, D-dimer (fibrin degradation marker) levels, prothrombin time prolongation, and fibrinogen concentration. Each parameter is scored from 0 to 3 based on the degree of abnormality, with a maximum total of 8 points. A cumulative score of 5 or more indicates probable overt DIC.
Methodology
The ISTH DIC scoring system was established by the Scientific Standardization Committee of the International Society on Thrombosis and Haemostasis (Levi et al., 2001; updated in British Journal of Haematology, 2009). It is the most widely validated and recommended tool for DIC diagnosis in clinical practice worldwide. The scoring algorithm weights platelet count (0-2 points), fibrin-related markers such as D-dimer (0-3 points), PT prolongation (0-2 points), and fibrinogen level (0-1 point).
Regional Notes
India: DIC is commonly seen in tertiary-care hospitals due to sepsis, obstetric complications (especially in rural areas with limited antenatal care), and venomous snake bites. The ISTH score is recommended by the Indian Society of Haematology & Blood Transfusion for standardised DIC diagnosis.
US: The ISTH DIC score is endorsed by the American Society of Hematology and is used in most academic medical centers. Alternative scoring systems (e.g., the Japanese JAAM DIC score) are occasionally used in research settings but the ISTH score remains the clinical standard.
UK: The British Committee for Standards in Haematology (BCSH) guidelines recommend the ISTH scoring system for DIC diagnosis. The UK National Health Service (NHS) uses this scoring in critical care and hematology departments nationwide.
Frequently Asked Questions
What is DIC syndrome?
DIC (disseminated intravascular coagulopathy) is a paradoxical syndrome where patients have both too much and too little clotting simultaneously. Systemic coagulation activation consumes clotting factors and platelets, causing bleeding in other parts of the body. DIC is not a disease itself but a complication of an underlying condition such as sepsis, trauma, or cancer.
How is the ISTH DIC score calculated?
The ISTH DIC score evaluates four laboratory parameters: platelet count (>100 = 0 pts, 50-100 = 1 pt, <50 = 2 pts), elevated fibrin markers / D-dimer (none = 0 pts, moderate = 2 pts, strong = 3 pts), prolonged prothrombin time (<3s = 0 pts, 3-6s = 1 pt, >6s = 2 pts), and fibrinogen level (>1 g/L = 0 pts, <1 g/L = 1 pt). A total score of 5 or more indicates probable overt DIC.
What does a DIC score of 5 or higher mean?
A score of 5 or more on the ISTH scale indicates probable overt disseminated intravascular coagulation. This is a medical emergency requiring immediate evaluation and treatment of the underlying cause, along with supportive care such as blood product transfusion, clotting factor replacement, and close monitoring in an intensive care setting.
What are the common causes of DIC?
Common causes of DIC include sepsis and severe infections, major trauma and tissue injury, obstetric complications (such as placental abruption and amniotic fluid embolism), malignant cancers (especially acute promyelocytic leukemia and pancreatic cancer), organ injuries (pancreatitis, liver failure), and severe transfusion reactions.
Can DIC be treated?
Yes, DIC can be treated. The primary approach is treating the underlying cause. Supportive treatments include blood and platelet transfusions, plasma replacement, heparin administration (if thrombosis is predominant), and tranexamic acid (if bleeding is the major problem). Survival depends on early recognition and treating the root cause.
What is the difference between DIC and HELLP syndrome?
HELLP syndrome (hemolysis, elevated liver enzymes, low platelets) is a pregnancy-related complication, while DIC can result from many causes including trauma, infection, and cancer. HELLP presents with nausea and hypertension; DIC presents with bleeding and/or ischemic symptoms. Both involve low platelets, but DIC also shows elevated fibrin degradation products and prolonged prothrombin time.
Is this calculator a substitute for medical diagnosis?
No. This calculator is for informational and educational purposes only. It uses the ISTH scoring guidelines to estimate DIC probability but cannot replace a professional medical evaluation. Always consult a qualified physician for diagnosis and treatment of any medical condition.
How often should the DIC score be reassessed?
According to ISTH guidelines, if the initial score is below 5 but clinical suspicion remains high, the patient should be reassessed on the DIC scale every 24 hours. DIC is a dynamic condition and repeat testing helps capture evolving coagulopathy. In acute settings, more frequent monitoring may be necessary.