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Lag times between blood sampling, spinning and plasma glucose estimation
S McIntyre1, C A Crowther, J E Hiller
1Department of Neonatal Medicine, Women's and Children's Hospital, North Adelaide, South Australia.
Summary
Glucose levels in blood samples decrease significantly when there is a delay between collection and analysis, especially before sample spinning. Prioritizing sample spinning is crucial for accurate glucose tolerance test results.
Area of Science:
- Clinical Biochemistry
- Endocrinology
- Diagnostic Laboratory Medicine
Background:
- Accurate plasma glucose measurement is critical for diagnosing and managing metabolic disorders like diabetes.
- Glucose tolerance test (GTT) protocols rely on timely and proper blood sample handling to ensure reliable results.
- Variability in pre-analytical sample handling can impact glucose assay accuracy.
Purpose of the Study:
- To evaluate the impact of pre-analytical lag times on plasma glucose concentrations.
- To determine optimal blood sample handling procedures for glucose tolerance testing.
- To inform guidelines for GTT protocols regarding sample management.
Main Methods:
- Investigated the effect of varying lag times between blood sampling and glucose analysis.
- Assessed plasma glucose stability under different conditions: post-sampling before spinning, and post-spinning before analysis.
- Utilized plasma glucose measurements from 6 healthy volunteers undergoing simulated GTT conditions.
Main Results:
- Plasma glucose levels remained stable when samples were spun down promptly and analyzed with varying lag times.
- A significant decrease in plasma glucose was observed within the first 2 hours when a lag time occurred between blood sampling and sample spinning.
- No further significant glucose decline was noted with extended lag times beyond 2 hours post-sampling before spinning.
Conclusions:
- Blood sample handling protocols for glucose tolerance tests must include specific instructions for the period between collection and analysis.
- Prioritizing the immediate spinning down of blood samples after collection is essential to prevent glucose degradation and ensure accurate results.
- Current GTT protocols may require revision to emphasize timely sample processing to maintain plasma glucose integrity.