order of draw
The standardized sequence for collecting multiple blood specimens to prevent cross-contamination between tube additives.
Full Definition
The order of draw is a critical safety protocol that specifies the sequence in which different blood collection tubes should be filled during a single venipuncture procedure. This standardized order prevents contamination of specimens with additives from previously filled tubes, which could lead to erroneous laboratory results and potential patient harm. The typical order progresses from sterile tubes (blood cultures) to tubes with clot activators, then anticoagulated tubes. Each healthcare facility may have slight variations, but the fundamental principle remains consistent. Deviation from proper order of draw can compromise test accuracy and require specimen recollection.
Usage
Usage note: Must be documented when multiple tubes are collected from a single venipuncture
In Context
- "The phlebotomist followed proper order of draw: blood culture, red-top, light blue, gold, green, lavender, and gray tubes." — Procedure documentation
- "Incorrect order of draw resulted in EDTA contamination of the PT/INR specimen, requiring recollection." — Incident report