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Practical value of a new serum digitoxin assay
Therapeutic Drug Monitoring
|January 1, 1986
Summary
The TDx fluorescence polarization immunoassay offers a comparable alternative to radioimmunoassay (RIA) for digitoxin measurement. This study found a strong correlation between the two methods, suggesting TDx as a viable option for clinical use.
Area of Science:
- Clinical Chemistry
- Immunoassays
- Pharmacokinetics
Background:
- Accurate measurement of serum digitoxin is crucial for therapeutic drug monitoring.
- Radioimmunoassay (RIA) is a common method, but newer techniques offer potential advantages.
Purpose of the Study:
- To evaluate the TDx fluorescence polarization immunoassay for digitoxin quantification.
- To compare TDx assay results with those obtained from RIA.
Main Methods:
- Serum samples from 15 patients undergoing digitoxin therapy were analyzed.
- Simultaneous analysis using TDx and RIA was performed on 33 paired samples.
- Linear regression analysis was used to compare results from the two assays.
Main Results:
- A strong correlation (r2 = 0.95) was observed between TDx and RIA results for 24 valid paired samples.
- TDx results were lower than RIA in five samples, primarily in patients with reduced creatinine clearance.
- The TDx assay demonstrated good agreement with RIA for digitoxin measurement.
Conclusions:
- The TDx system is a comparable alternative to RIA for digitoxin analysis.
- Potential differences in specificity and sensitivity warrant further investigation.
- TDx offers a potentially valuable tool for therapeutic drug monitoring of digitoxin.