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A colorimetric method, based on the Kober reaction, was adapted for the determination of urinary estrogens during pregnancy. The method yields final volumes for direct measurements by a multichannel computer-controlled photometer. The speed of the analysis was increased so that 100 samples can easily be completed by one laboratory technician as triplicate analyses during one working day. A satisfactory accuracy and precision of the method were also achieved. The values were determined using urine samples from 1097 apparently healthy pregnant women.

A Discrete Multichannel Procedure for the Chemical Determination of Urinary Estrogens during Pregnancy