Preanalytical errors in ionized calcium measurements induced by the use of liquid heparin.
Ann Clin Biochem
; 28 ( Pt 2): 167-73, 1991 Mar.
Article
em En
| MEDLINE
| ID: mdl-1859155
ABSTRACT
The use of heparin in a liquid form to measure ionized calcium (Ca++) in plasma or whole blood can induce preanalytical errors by dilution and by changing the original Ca++ value by binding or by re-equilibration with calcium in the anticoagulant solution. To quantify these errors, Ca++ was measured on serum pools under different sampling conditions. Incomplete syringe filling and specimen volume/syringe nominal volume ratio effects were tested. Syringes were rinsed with saline to yield pure dilution effects, with sodium heparinate to study binding and with calcium-titrated heparinate to evaluate 'calcium-distortion'. Detailed tables provide percentage error values for all sampling conditions. Dilution errors could reach -5% and binding was always important (-14 to -50%). Distortion was minimal around 1.25 mmol/L but could reach -4% for high and +8% for low Ca++ values. Errors increased when syringes were not filled to their nominal volume, especially with small-sized specimens.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Heparina
/
Cálcio
/
Erros de Diagnóstico
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Revista:
Ann Clin Biochem
Ano de publicação:
1991
Tipo de documento:
Article
País de afiliação:
França