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Clinical Chemistry 32: 763-767, 1986;
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Clinical Chemistry, Vol 32, 763-767, Copyright © 1986 by American Association for Clinical Chemistry

Direct solid-phase chemiluminescence immunoassay for salivary progesterone

J De Boever, F Kohen and D Vandekerckhove

A simple, direct chemiluminescence immunoassay for progesterone in mixed, unstimulated saliva is described. We use purified polyclonal anti-progesterone antibodies covalently coupled to polyacrylamide beads and progesterone-11 alpha-hemisuccinyl-aminobutylethyl isoluminol as the chemiluminescent ligand marker. Bound and free ligand are separated by simple centrifugation. The detection limit of the assay is 1.5 pg per tube (38 pmol/L). Intra- and interassay coefficients of variation for low, medium, and high progesterone concentrations are 7.9, 6.8, 8.8% and 9.3, 6.9, 8.5%, respectively. Analytical recovery of added progesterone is 99.6%. Mean +/- SD progesterone concentrations (pmol/L) in saliva are 178 +/- 46 in the follicular phase, 313 +/- 90 in the periovulatory phase, and 658 +/- 166 in the luteal phase of the menstrual cycle. Correlation between progesterone concentrations in serum (assayed by RIA after extraction) and in saliva is good (r = 0.88, p less than 0.001, n = 96). The assay is simple, fast (4 h, including 1.5 h of incubation time), and reliable.


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