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Pitfalls in measuring high-density lipoprotein cholesterol concentrations in HIV-infected patients
G Aragonès1, R Beltrán, A Rull
1Centre de Recerca Biomèdica, Hospital Universitari Sant Joan, Institut d'Investigació Sanitària Pere Virgili, Universitat Rovira i Virgili, Reus, Spain.
Insights
Accurate high-density lipoprotein (HDL) cholesterol measurement is crucial for managing cardiovascular risk in HIV patients. A common assay shows inconsistencies, especially with stored samples, limiting its clinical trial utility.
Area of Science:
- Clinical Chemistry
- Cardiovascular Disease Research
- HIV/AIDS Medicine
Background:
- HIV infection and its treatments are linked to dyslipidemia and increased cardiovascular disease (CVD) risk.
- Accurate high-density lipoprotein (HDL) cholesterol measurement is vital for managing these metabolic abnormalities in HIV patients.
- Existing HDL cholesterol measurement methods require validation in this specific patient population.
Purpose of the Study:
- To evaluate the consistency and accuracy of a synthetic polymer/detergent homogeneous assay for measuring HDL cholesterol in HIV-infected individuals.
- To assess the impact of sample storage conditions on HDL cholesterol measurements in this cohort.
Main Methods:
- A synthetic polymer/detergent homogeneous assay was used to measure HDL cholesterol in samples from HIV-infected patients and healthy controls.
- Samples were analyzed at baseline and after storage (1 week at 4°C; 12 months at -80°C).
- Results were compared against ultracentrifugation and precipitation assays.
Main Results:
- Discrepancies in HDL cholesterol values were observed in 15% of HIV-infected patient samples compared to ultracentrifugation.
- Overestimation correlated with high C-reactive protein; underestimation correlated with plasma gamma-globulin levels.
- Storage conditions amplified these measurement discrepancies.
Conclusions:
- The synthetic polymer/detergent homogeneous assay demonstrates limited accuracy for direct HDL cholesterol measurement in HIV-infected patients.
- This assay's reliability is compromised by sample storage, making it less suitable for clinical trials involving analyzed frozen samples.
Objectives:
HIV infection and its treatment are associated with dyslipidaemia and increased risk of cardiovascular disease. Accurate high-density lipoprotein (HDL) cholesterol values are necessary for the management of these abnormalities, but current methods have not been properly assessed in these patients. The aim of this study was to assess in HIV-infected patients the consistency and accuracy of a synthetic polymer/detergent homogeneous assay used to measure HDL cholesterol concentrations and to evaluate the impact of storage.
Methods:
HDL cholesterol was measured using a synthetic polymer/detergent homogeneous method in samples from HIV-infected patients and healthy subjects for each of the storage regimens: baseline, after 1 week at 4 degrees C, and after 12 months at -80 degrees C. The ultracentrifugation and precipitation assays were used for comparison.
Results:
Three out of every 20 samples from HIV-infected patients had discrepant HDL cholesterol values with respect to the ultracentrifugation method. Overestimation was associated with high C-reactive protein concentrations and underestimation with plasma gamma-globulin concentrations, an effect that was amplified by any of the storage conditions tested.
Conclusions:
Caution is needed when using the synthetic polymer/detergent homogeneous method for direct measurement of HDL cholesterol concentrations in HIV-infected patients. This assay is of limited use in clinical trials in which frozen samples are analysed.
