A total of 17 different commercial control serums prepared by 6 manufacturers were examined to determine the accuracy of labeled values for as many as 9 constituents. All serums were analyzed by generally acceptable reference procedures. Several lots of each product were checked at approximately 6-month intervals up to 2 years or more to assess their stability on storage. It is concluded that commercial control serums should not be used in place of a primary standard when the constituents to be assayed can be obtained in a relatively pure form and a stable solution can be prepared.
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Logan et al. (1968) studied this question.
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