Khupulsup, KPetchclai, BChiewsilp, D2009-05-272009-05-271981-02-01Khupulsup K, Petchclai B, Chiewsilp D. Comparison of hemagglutination inhibiton test and radioimmunoassay for morphine in urine. Journal of the Medical Association of Thailand. 1981 Feb; 64(2): 72-5http://imsear.searo.who.int/handle/123456789/44808Chotmaihet Thangphaet.engHemagglutination Inhibition TestsHeroin Dependence --diagnosisHumansMorphine --urineRadioimmunoassayComparison of hemagglutination inhibiton test and radioimmunoassay for morphine in urine.Comparative Study