Carefully performed selective biochemical testing of urine may be useful and cost effective.' 2 Nevertheless, in addition to ensuring that tests are performed to answer specific clinical questions, it must be ensured that the analysis is carried out correctly. This paper reviews current analytical performance achieved, describes real and potential sources of analytical difficulties, and expands on the details of simple strategies2 to overcome these problems.
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Callum G. Fraser (1985) studied this question.
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