An immunochemical procedure for routine laboratory diagnosis of pregnancy utilizing adsorption of human chorionic gonadotrophin onto kaolin and the Ortho pregnancy test reagents is described. The method is suitable for quantitative assay of urinary human chorionic gonadotrophin and can be adapted for use with serum. It was found to compare favourably with the reliability of Galli-Mainini toad tests. It avoids the disadvantages of `biological' tests and is quicker to perform.
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