Study evaluates the effect of the ‘order of draw’ on blood tests

0

“The ‘order of draw’ has been advocated since 1982 to reduce the risk of cross-contaminating blood tubes with additives from a previously filled tube.”  Indevuyst et al (2014).

Reference:

Indevuyst, C., Schuermans, W., Bailleul, E. and Meeus, P. (2014) The order of draw: much ado about nothing? International Journal of Laboratory Hematology. April 8th. [epub ahead of print].

Abstract:

INTRODUCTION: The ‘order of draw’ has been advocated since 1982 to reduce the risk of cross-contaminating blood tubes with additives from a previously filled tube.

METHODS: We studied 193 patients receiving oral anticoagulation. Multiple tubes were collected in a specific order using the Sarstedt Safety Monovette System. We evaluated the effect of the ‘order of draw’ on the prothrombin time/international normalized ratio (PT/INR) and the activated partial thromboplastin time (APTT) when the citrate tube is drawn as the first tube, second tube or after a heparin, EDTA or serum tube with clot activator.

RESULTS: There was no statistically significant influence on the PT/INR. The same applies for the APTT measured on a citrate tube drawn after a heparin tube. There was a small, but statistically significant bias on the APTT when the citrate tube was drawn as the first tube, after an EDTA tube or after a serum tube with clot activator. We consider this bias (max. 0.2 s) as not clinically significant.

CONCLUSION: The order of draw has no significant influence on the PT/INR and APTT when measured on a Sarstedt citrate tube filled without the use of a discard tube or after a heparin, EDTA or serum tube with clot activator.

Other intravenous and vascular access resources that may be of interest (External links – IVTEAM has no responsibility for content).

Main page

Share.

Comments are closed.

Free Email Updates
Join 5.5K IVTEAM members. Subscribe now and be the first to receive all the latest free updates from IVTEAM!
100% Privacy. We don't spam.