NHA Certified Phlebotomy Technician (CPT)Safety and ComplianceHard
A phlebotomy technician is performing a quality control check on a new lot of evacuated blood collection tubes. Which of the following parameters is most crucial to verify to ensure accurate test results?
- AThe expiration date of the tubes.
- BThe packaging integrity of the tubes.
- CThe absence of dust inside the tubes.
- DThe color of the tube stoppers.
Show answer & explanationAnswer & explanation
Correct answer: A. The expiration date of the tubes.
The expiration date is critical because it indicates the shelf life during which the tube's vacuum is guaranteed and any additives remain stable and effective. An expired tube may have lost its vacuum, leading to an underfilled tube, or its additives may have degraded, both of which can significantly alter test results.
Why the other options are wrong
- B. Packaging integrity is important for sterility, but an intact package doesn't guarantee the tube itself is unexpired or functional.
- C. Dust inside is undesirable but less critical than the expiration date, as dust can often be removed or is less likely to affect results than compromised vacuum or additives.
- D. While stopper color indicates the additive, it's not a direct measure of functional quality for the specific lot.
Quality Control for Blood Collection Tubes
Procedures to ensure that blood collection tubes meet specifications for vacuum, sterility, and additive integrity to provide accurate laboratory results.
- Expiration date is paramount for vacuum and additive stability.
- Loss of vacuum leads to underfilling and incorrect additive-to-blood ratios.
- Degraded additives can cause inaccurate test results.
Memory trick: Tube 'T'ime 'T'ells 'T'rue 'T'est 'T'hrough 'T'he 'T'op.