A specific enzymeimmunoassay for progesterone in human plasma.

Area of Science:

• Biochemistry
• Immunology
• Analytical Chemistry

Background:

• Plasma progesterone determination is crucial for various clinical applications.
• Existing methods like radioimmunoassay may require specialized equipment or expertise.
• There is a need for accessible and reliable progesterone assays in smaller clinical settings.

Purpose of the Study:

• To establish a novel enzyme immunoassay (EIA) for quantifying plasma progesterone.
• To validate the specificity, precision, and accuracy of the developed EIA.
• To compare the performance of the EIA with established radioimmunoassay (RIA) methods.

Main Methods:

• Developed an enzyme immunoassay utilizing horseradish peroxidase-conjugated progesterone as the label.
• Employed Sepharose-coupled antiprogesterone antiserum for the separation of free and bound steroid.
• Validated the assay against radioimmunoassay (RIA) with and without thin-layer chromatography (TLC).

Main Results:

• The developed enzyme immunoassay demonstrated high specificity, precision, and accuracy.
• Excellent agreement was observed between EIA and RIA results (correlation coefficient r > 0.98).
• The EIA performance remained consistent with or without prior thin-layer chromatography purification.

Conclusions:

• The established enzyme immunoassay provides a reliable and accurate method for plasma progesterone measurement.
• This EIA is particularly well-suited for routine progesterone determination in smaller clinical laboratories.
• The assay offers a practical alternative to radioimmunoassay, enhancing accessibility in clinical diagnostics.