Effects of Common Matrices on TSH Assay Performance
Author Information
Author(s): R. E. Gaines-Das, A. F. Bristow, H. Brettschneider
Primary Institution: WHO International Laboratory for Biological Standards, National Institute for Biological Standards and Control
Hypothesis
Does a common matrix for calibrators improve between-laboratory agreement for TSH immunometric assays?
Conclusion
Using a common matrix for TSH standards only marginally improved between-laboratory variability.
Supporting Evidence
- Two matrices tested were suitable for use as a common matrix for TSH standards.
- The third matrix (wheat-germ lectin treated serum) was not suitable in all assay systems.
- Variability of estimates for hyperthyroid samples may be associated with intrinsic properties of the sample.
Takeaway
The study looked at whether using the same type of sample for testing TSH levels helps labs get similar results, and it found that it doesn't help much.
Methodology
The study involved nine laboratories testing TSH levels using different serum samples and calibrators to compare results.
Limitations
The study did not find significant improvements in variability with a common matrix, suggesting that sample-specific factors may play a larger role.
Participant Demographics
Participants included nine manufacturers of TSH immunometric assay kits.
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