Development and Validation of an Enzymatic Method for Total Cholesterol Analysis Using Whole Blood Spot

Gaetano Corso, Francesco Papagni, Monica Gelzo, Monica Gallo, Rosalba Barone, Maria Graf, Nicola Scarpato, Antonio Dello Russo

Research output: Contribution to journalArticle

Abstract

Background: High serum cholesterol represents a risk factor for cardiovascular disease. This study aims to quantify total cholesterol in dried blood spot (DBS) by direct enzymatic method. Methods: Three hundred seventeen blood samples with serum cholesterol level ranging from 81 to 337 mg/dl were collected. DBS were manually prepared, cholesterol was extracted using methanol and analyzed by a manual enzymatic method. DBS cholesterol method was validated for imprecision and extraction efficacy. DBS cholesterol values were correlated (training test) with serum values measured by automated enzymatic method (reference method). The obtained correlation was used for predicting serum cholesterol from DBS analysis of a new sample group (validation test, n = 58). Results: Within-day and between-day coefficient of variation (CV%) were lower than 7.69 and 6.32, respectively. Residual cholesterol in DBS after extraction was 16%. DBS cholesterol and serum cholesterol showed a linear correlation (slope = 0.5217; r = 0.9139) and a bias of −28%. Furthermore, DBS cholesterol values of validation test (n = 58), converted using the training test correlation, were not statistically different compared to the corresponding plasma values (P = 0.9487), and the comparison by Passing and Bablok showed a linear regression with a slope of 1.068 (r = 0.611) and a bias of −0.22%. Conclusions: The results show that this enzymatic method is suitable to analyze cholesterol in DBS and it could be automated and used for population screening of total blood cholesterol.

Original languageEnglish
Pages (from-to)517-523
Number of pages7
JournalJournal of Clinical Laboratory Analysis
Volume30
Issue number5
DOIs
Publication statusPublished - Sep 1 2016
Externally publishedYes

Keywords

  • chronic degenerative diseases
  • dried blood spot
  • total blood cholesterol

ASJC Scopus subject areas

  • Immunology and Allergy
  • Hematology
  • Public Health, Environmental and Occupational Health
  • Clinical Biochemistry
  • Medical Laboratory Technology
  • Biochemistry, medical
  • Microbiology (medical)

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    Corso, G., Papagni, F., Gelzo, M., Gallo, M., Barone, R., Graf, M., Scarpato, N., & Dello Russo, A. (2016). Development and Validation of an Enzymatic Method for Total Cholesterol Analysis Using Whole Blood Spot. Journal of Clinical Laboratory Analysis, 30(5), 517-523. https://doi.org/10.1002/jcla.21890