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Serum pooling lowers cholesterol recovery
M Wills1, G Gerhardt, M A Holtz
1Department of Pathology, Johns Hopkins School of Medicine, Baltimore, USA.
European Journal of Clinical Chemistry and Clinical Biochemistry : Journal of the Forum of European Clinical Chemistry Societies
|July 1, 1997
Summary
Serum pooling significantly impacts cholesterol measurement accuracy. Pooled samples showed a 1.1-1.7% lower cholesterol recovery compared to individual samples, affecting clinical accuracy.
Area of Science:
- Clinical Chemistry
- Analytical Chemistry
- Biochemistry
Background:
- Matrix effects can compromise accuracy in clinical assays.
- A common assumption is that pooled and individual samples yield comparable results for cholesterol.
- The influence of serum pooling on cholesterol recovery remains unclear.
Purpose of the Study:
- To investigate whether serum pooling affects cholesterol recovery.
- To quantify the impact of serum pooling on cholesterol measurement accuracy.
Main Methods:
- Cholesterol levels were determined for 100 individual serum samples and a pooled sample using Hitachi 717 and 914 analyzers.
- Daily cholesterol measurements were performed on individual and pooled samples over twenty days using Hitachi 736 and 747 analyzers.
Main Results:
- The 100-sample pool exhibited 1.1-1.5% lower cholesterol values than individual samples.
- The daily pool study revealed a 1.7% lower cholesterol ratio for pooled samples compared to individual samples across analyzers.
- The observed decrease in recovery (1.1-1.7%) represents a significant portion (37-57%) of the allowable bias for cholesterol (<3%).
Conclusions:
- Serum pooling leads to a significant decrease in cholesterol recovery.
- The observed reduction in recovery due to pooling is clinically relevant and exceeds acceptable bias limits.
- The assumption of similar results between pooled and individual serum samples for cholesterol is invalid.