[Blood group determination of a single hair]

Using the mixed cell agglutination reaction (MCAR) in a modification by Ishiyama and Okada (MCAR on adhesive tape) we examined single rootless hairs collected from 65 men, women and children (aged 6 months to 80 years). Correct results gave 57 probes (87%). False-positive and false-negative results mainly occurred at non-secretor donors. The modified method is quickly done, reproducible and does not alter the hair.