NHA Certified Phlebotomy Technician (CPT)Specimen HandlingMedium
A phlebotomy technician is storing several collected specimens overnight before they can be transported to a reference lab. Which of the following conditions is generally appropriate for storing most routine chemistry and immunology specimens if immediate testing is not possible?
- AIn a warming incubator (37°C).
- BRefrigerated (2-8°C).
- CFrozen (-20°C or colder).
- DRoom temperature (20-25°C) on the counter.
Show answer & explanationAnswer & explanation
Correct answer: B. Refrigerated (2-8°C).
For most routine chemistry and immunology specimens, refrigeration at 2-8°C is the standard storage condition if immediate testing is not possible. This temperature range slows down metabolic processes and degradation of analytes, preserving specimen integrity for a limited time (typically up to 24-48 hours depending on the analyte).
Why the other options are wrong
- A. Warming incubators are used for very specific tests (e.g., cold agglutinins) but would accelerate degradation for most other specimens.
- C. Freezing is reserved for specific analytes requiring long-term preservation or those unstable at refrigeration temperatures, and improper freezing/thawing can cause issues.
- D. Room temperature storage for extended periods can lead to significant analyte degradation and cellular metabolism affecting results.
Routine Specimen Storage
Most routine chemistry and immunology specimens, if not immediately tested, should be stored refrigerated (2-8°C) to slow down degradation and maintain analyte stability for short periods.
- 2-8°C is standard for short-term.
- Prevents bacterial growth.
- Minimizes analyte breakdown.
Memory trick: Routine Storage: Fridge is Your Best Friend.