A kit for serum calcium determination (Calcium Rapid Stat Kit), based on a methyl thymol blue method, has been investigated and the results compared with those obtained from an AutoAnalyzer cresolphthalein complexone method. The kit technique is simple, requires a small amount of serum and has a better precision than the AutoAnalyzer method, with which it correlates well. The standards supplied should be checked before use.
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Cossar et al. (1974) studied this question.
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