ISTH Scientific and Standardization Committee — Bleeding Assessment Tool (ISTH-BAT)

A standardized structured interview tool for quantifying bleeding history to diagnose bleeding disorders. Developed by the ISTH SSC (Scientific and Standardization Committee) to provide a reproducible measure of the bleeding phenotype across clinical studies. Normal score is 0–3 for adult women and 0–2 for men and children. Abnormal score suggests clinical bleeding disorder warranting further workup.