Drawing blood samples from vascular access devices: evidence-based practice.

Abstract

Venous catheters are placed for the purpose of infusion, and, in the case of central vascular devices, for drawing blood specimens for laboratory analysis. Little scientific research exists on optimal methods to obtain blood samples from catheters, and clinicians use a variety of non-proven techniques. This article includes an overview of multiple techniques, review of research studies and publications, and recommendations for current practice.