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Background  Circulating  l ‐lactate concentration is commonly measured in hospitalized horses by sampling from indwelling intravenous ( IV ) catheters. However, there are no published evidence‐based recommendations to prevent contamination by lactated Ringer's solution ( LRS ).    Hypothesis  Withdrawing 10 mL of blood from the  LRS ‐containing extension set connected to the  IV  catheter before obtaining the sample for analysis should be adequate to obtain accurate measurement of blood lactate concentration ( BLC ).    Animals  Thirty‐three adult hospitalized horses receiving constant rate infusion of  LRS .    Methods  Immediately after disconnecting the  LRS , 5 sequential 5 mL blood samples were obtained by aspiration from an extension set connected to an indwelling  IV  catheter, followed by 3 samples collected by direct venipuncture of the contralateral jugular vein. Samples were analyzed with 1 portable blood lactate analyzer. A linear mixed model was used to examine differences in lactate concentrations among samples collected from the catheter and by direct venipuncture.    Results  After considering differences in age, breed, sex, and reason for hospitalization,  BLC s were higher ( P  < .001) in the first and second 5 mL samples collected through the extension set/catheter than in all other extension set/catheter samples or the direct venipuncture samples. The largest difference observed between the third and subsequent catheter or venipuncture samples was 0.34 mmol/L with an upper 95%  CI  of 1.12 mmol/L.    Conclusions and Clinical Importance  Withdrawing 15 mL of blood from a  LRS ‐containing extension set connected to an  IV  catheter (5.9 mL total volume capacity) before obtaining the sample for blood lactate analysis is suggested to optimize accuracy of  BLC  measurements.

journal of veterinary internal medicine

The Effect of Inadequate Presample Blood Volume Withdrawal from Intravenous Catheter and Extension Sets on Measured Circulating L‐Blood Lactate Concentration in Horses Receiving Lactated Ringer's Solution