Bilirubln interference with the KinetIc Jaff # { 233 } Method for Serum Creatinine

392 CLINICAL CHEMISTRY, Vol. 24, No. 2, 1978 In the case of copper and zinc, the authors are to be congratulated on the excellent reproducibility of the techniques used. The fact that different wash procedures gave somewhat different results need not be surprising if one assumes that the efficiency in nemoving contaminating metal varied with the procedure. A point of criticism is their use of an ionic detergent, sodium lauryl sulfate, because this is more likely to leach out bound metal from the hair than is a nonionic detergent. Furthermore, if the authors suspected that bound metal was being leached out by their washing procedure, surely the experiments should have been performed for various periods of time. The authors’ contention that “hair