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Clinical Chemistry 20: 365-368, 1974;
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Clinical Chemistry, Vol 20, 365-368, Copyright © 1974 by the American Association for Clinical Chemistry

Single-Antibody Technique for Radioimmunoassay of Cortisol in Unextracted Serum or Plasma

Lowell B. Foster 1 and Ralph T. Dunn 1

1 Patterson Coleman Laboratories, 4807 North Armenia, Tampa, Fla. 33603.

A radioimmunoassay procedure for cortisol is described that requires only 5 µl of serum or plasma. Native cortisol-binding proteins are denatured by heating 5 µl of sample in 0.2 ml of glutamate buffer in a boiling water bath for 15 min. After a 2-h incubation of heat-treated serum or plasma with [H3]cortisol and cortisol antibody, "free" and "bound" cortisol are separated by use of hemoglobin-coated charcoal. The method is easy and sensitive, and results compare favorably with those of a well-accepted acid-fluorescence method. In addition, we show that serum and heparinized plasma yield the same results by this method, and therefore either can be assayed by this procedure.


Key Words: results for cortisol by acid-fluorescence compared • assessment of adrenocortical function • cortisol—albumin conjugate as antigen • normal values • "kit" methods

Submitted on November 14, 1973
Accepted on December 19, 1973




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Copyright © 1974 by the American Association for Clinical Chemistry.