Development of a solid-phase chemiluminescence immunoassay for plasma progesterone

Area of Science:

• Clinical Chemistry
• Immunochemistry
• Analytical Chemistry

Background:

• Accurate progesterone measurement is crucial for reproductive health monitoring.
• Existing methods like radioimmunoassay (RIA) have limitations including radioisotope use and complex procedures.
• Development of non-isotopic, automated assays is desirable for clinical diagnostics.

Purpose of the Study:

• To describe a solid-phase chemiluminescence immunoassay (CLIA) for quantifying progesterone in human plasma.
• To evaluate the performance of this CLIA compared to established radioimmunoassay (RIA) methods.
• To highlight the advantages of CLIA in terms of speed, automation, and safety.

Main Methods:

• A solid-phase immunoassay utilizing a progesterone-isoluminol conjugate as the chemiluminescent marker.
• Passive adsorption of an IgG fraction of antiserum to progesterone onto polystyrene test tubes (Lumacuvettes P).
• Chemiluminescence detection via oxidation with a hydrogen peroxide-microperoxidase system at alkaline pH.

Main Results:

• The assay demonstrated a log-linear decrease in light yield with increasing free progesterone concentration (15-1000 pg/tube).
• The developed chemiluminescence immunoassay showed comparable sensitivity, specificity, precision, and accuracy to radioimmunoassay.
• The method eliminated the need for radioisotopes and centrifugation steps, simplifying the assay.

Conclusions:

• The described chemiluminescence immunoassay provides a sensitive, specific, precise, and accurate method for progesterone determination in human plasma.
• This assay offers significant advantages over RIA, including speed, ease of automation, and avoidance of radioisotopes.
• The developed CLIA is a viable and advantageous alternative for routine clinical progesterone analysis.