Related Experiment Videos
A rapid, sensitive and specific radioimmunoassay for methotrexate
Clinica Chimica Acta; International Journal of Clinical Chemistry
|November 1, 1977
Summary
A new radioimmunoassay accurately measures methotrexate in blood samples, aiding timely clinical decisions for high-dose cancer therapy. This sensitive method provides rapid results to manage potential toxicity and guide treatment.
Area of Science:
- Biochemistry
- Immunology
- Clinical Chemistry
Background:
- High-dose methotrexate therapy requires precise monitoring to prevent toxicity.
- Existing methods for methotrexate measurement may lack the required speed or sensitivity.
Purpose of the Study:
- To develop and validate a rapid and sensitive radioimmunoassay for quantifying serum methotrexate levels.
- To assess the method's suitability for clinical monitoring in high-dose methotrexate therapy.
Main Methods:
- Development of a radioimmunoassay using tritiated methotrexate and specific rabbit antiserum.
- Separation of bound and free drug utilizing a donkey anti-rabbit precipitating serum.
- Validation of the assay for sensitivity (50 fmol), specificity (folates, citrovorum factor), and throughput (30 samples/day).
Main Results:
- The radioimmunoassay demonstrated high sensitivity and specificity, unaffected by natural folates or citrovorum factor.
- The assay provided results within 6 hours, with a capacity for 30 samples daily.
- Accurate quantification of methotrexate down to 50 fmol in capillary blood samples was achieved.
Conclusions:
- A rapid, sensitive radioimmunoassay for methotrexate has been successfully developed.
- This assay is suitable for timely monitoring of serum methotrexate levels during high-dose therapy.
- The method facilitates prompt clinical decisions regarding toxicity management and rescue therapy.