Clinical Chemistry
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Clinical Chemistry 25: 1323-1324, 1979;
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Clinical Chemistry, Vol 25, 1323-1324, Copyright © 1979 by American Association for Clinical Chemistry

Radioimmunoassay of total urinary estrogens

RW Bordens and RH Engel

We describe a radioimmunoassay for total estrogens in urine. Estrogens are extracted by adsorption on XAD-2 resin, eluted with methanol, and acid-hydrolyzed. Estrogens are then determined in a diluted aliquot of the hydrolysate. Within-run coefficients of variation for estriol values between 6.0 and 100 micrograms/L were less than 5%; between-run CV was 19.6% at an estriol concentration of 16.8 microgram/L. A correlation coefficient of 0.96 was found on comparison of the radioimmunoassay (y) with a standard fluorometric assay (x); the regression equation is y = 2.18 x - 6.70 micrograms/L. Determination on pregnancy and non-pregnancy urine can be done within 4 h.




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Copyright © 1979 by the American Association for Clinical Chemistry.