Development and Evaluation of a Disposable Device for Performing Simultaneous Duplicate Bleeding Time Determinations

Babson, Susan R., and Babson, Arthur L.: Development and evaluation of a disposable device for performing simultaneous duplicate bleeding time determinations. Am J Clin Pathol 70: 406–408, 1978. A disposable bleeding time device that provides two simultaneous standardized incisions is described. The mean bleeding time of 47 normal adults was 4.1 min with a 95% range of 2.2–7.0 min. The standard deviation of duplicate bleeding times was 0.7 min, and the day-to-day standard deviation for individuals was 0.9 min. In a double-blind crossover study of 20 normal adults, the mean bleeding time increased from 3.7 to 6.2 min after ingestion of 1 g aspirin. The device is extremely simple to use and is essentially painless. Physical trauma is minimal.