Assessment of the effect of dilution of blood samples with sodium heparin on blood gas, electrolyte, and lactate measurements in dogs

Katrina Hopper, Marlis L. Rezende, Steve C. Haskins

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Objective - To evaluate the effect of dilution of blood samples with sodium heparin on blood gas, electrolyte, and lactate measurements in dogs. Sample population - Venous blood samples collected from 6 adult dogs of various breeds. Procedure - Syringes were prepared with anticoagulant via 1 of 4 techniques, and the residual volume of liquid heparin in each type of prepared syringe was determined. Blood gas values and other selected clinicopathologic variables were measured in whole blood samples after collection (baseline) and after aliquots of the samples were diluted with heparin via 1 of the 4 manual syringe techniques. By use of a tonometer, whole blood samples were adjusted to 1 of 3 oxygen concentrations (40, 100, or 600 mm Hg) and the PO2 values were measured at baseline and subsequent to the 4 heparin dilutions. Results - The 4 syringe techniques resulted in 3.9%, 9.4%, 18.8%, and 34.1% dilutions of a 1-mL blood sample. Compared with baseline values, dilution of blood samples with liquid heparin significantly changed the measured values of PCO2, PO2, and base deficit and concentrations of electrolytes and lactate. Of the variables assessed, measurement of ionized calcium concentration in blood was most affected by heparin dilution. Conclusions and clinical relevance - These findings in dogs indicate that dilution of blood samples with heparin can be a source of preanalytical error in blood gas, electrolyte, and lactate measurements. Limiting dilution of blood samples with heparin to < 4% by volume via an evacuation technique of syringe heparinization is recommended.

Original languageEnglish (US)
Pages (from-to)656-660
Number of pages5
JournalAmerican Journal of Veterinary Research
Volume66
Issue number4
DOIs
StatePublished - Apr 2005

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blood gases
heparin
Electrolytes
electrolytes
lactates
Heparin
Lactic Acid
Gases
sodium
Dogs
dogs
syringes
blood
Syringes
sampling
liquids
anticoagulants
dog breeds
Residual Volume
methodology

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Assessment of the effect of dilution of blood samples with sodium heparin on blood gas, electrolyte, and lactate measurements in dogs. / Hopper, Katrina; Rezende, Marlis L.; Haskins, Steve C.

In: American Journal of Veterinary Research, Vol. 66, No. 4, 04.2005, p. 656-660.

Research output: Contribution to journalArticle

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