Medical Assistant Prep / Unit 19 MAS 466 short lesson, about 20 seconds
Why the Order Matters
Captions available
The idea
The order of draw exists to prevent additives from being carried from one tube into the next.
In practice
The needle that pierces a tube's stopper can carry a trace of its additive into the following tube, which can change that tube's results; cultures go first to protect them from contamination.
Where people slip
A small carryover can produce a large error in a sensitive test.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
- Nothing yet depends on this.
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