Evaluation of a fully-automated particle-enhanced turbidimetric immunoassay for the measurement of plasma lipoprotein(a). population-based reference values in an area with low incidence of cardiovascular disease.
OBJECTIVE
Lipoprotein(a) has been proposed as an independent risk factor for cardiovascular disease. This lipoprotein possesses a marked size polymorphism that makes difficult to measure accurately its concentration in plasma. The International Federation of Clinical Chemistry recently recommended to carefully evaluate new commercial methods for lipoprotein(a) measurement to discard the possible influence of lipoprotein(a) isoforms on immunoreactivity. They also recommended to perform population-based studies for different ethnic and geographic groups. Therefore, in the evaluation of a fully automated, particle-enhanced turbidimetric immunoassay for the measurement of lipoprotein(a) we have determined its reference interval in the Spanish population, an area with the lowest incidence of cardiovascular disease in Europe.


METHODS
We evaluated a commercial kit of reagents calibrated against the Proposed Reference Material and determined the effect of lipoprotein(a) size polymorphism on the measurements. A population-based study was carried out in two different villages on the Mediterranean coast of Spain.


RESULTS
Imprecision at different lipoprotein(a) concentrations ranged between 3.0 and 15.4%. Recovery was 98.5 +/- 2.1. Detection limit was 4.8 nmol/L. There were no significant interferences from lipemia, jaundice, hemolysis, paraproteinemia, apolipoprotein B or plasminogen. We did not observe any effect of the lipoprotein(a) size polymorphism on the measurements. Mean (and SD) values for plasma lipoprotein(a) (n = 369) were 53.6 (65.3) nmol/L, the median was = 25.3 nmol/L and range varied between <4.8 and 356.0 nmol/L.


CONCLUSIONS
The present article presents an accurate and practical assay for measuring plasma lipoprotein(a) concentrations and describes its reference values in a population of Spanish Caucasians. Our results are similar to those obtained in other Caucasian populations (between 10 and 25% higher than in participants of the CARDIA study).
Simó
Josep M
JM
Centre de Recerca Biomèdica, Institut de Recerca en Ciències de la Salut, Hospital Universitari de Sant Joan, C/ Sant Joan s/n, Reus, Catalunya, Spain.
Camps
Jordi
J
Gómez
Frederic
F
Ferré
Natàlia
N
Joven
Jorge
J
D000293:Adolescent; D000328:Adult; D000368:Aged; D001331:Automation; D002318:Cardiovascular Diseases / Q000097:blood* / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000379:methods / Q000592:standards*; D015994:Incidence; D017270:Lipoprotein(a) / Q000097:blood* / Q000235:genetics; D008297:Male; D008875:Middle Aged; D009391:Nephelometry and Turbidimetry / Q000379:methods / Q000592:standards*; D011110:Polymorphism, Genetic; D011159:Population Surveillance; D020033:Protein Isoforms / Q000097:blood; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D017270:Lipoprotein(a); D020033:Protein Isoforms