Practice Quiz

CPCT/A Patient Care Exam Test Prep

Category - Phlebotomy

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Which is first in the order of draws, a SST or PST?
  1. Hey, trick question! It is the same tube, just a different name.
  2. PST is first.
  3. SST is first.
  4. Since there is not a risk of additive cross-contamination, the order of draw does not apply.
Explanation
Answer: C - If a multi-test draw required using both, a SST collection tube and PST collection tube, the order would require drawing the SST first. SST/tiger tops contain a clot activator and gel separator, used to separate serum from blood products. Along with the gel separator, PST collection tubes also contain an anticoagulant additive, used to separate plasma from blood. To avoid contamination of the SST sample by the anticoagulant in the PST collection tube, the SST specimen should be collected first.
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