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

: 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.