NHA Phlebotomy Certification Practice Exam

What is the recommended storage temperature for a CBC collected after lab hours?

1. 0-4 degrees C

2. 2-10 degrees C

3. 15-25 degrees C

4. -20 degrees C

The correct answer is: 2-10 degrees C

The recommended storage temperature for a complete blood count (CBC) collected after lab hours is 2-10 degrees Celsius. This range ensures that the integrity of the blood sample is maintained, allowing for accurate analysis of the components of the blood. Storing samples within this temperature range helps to prevent the degradation of cells, which can distort the results of the CBC and lead to misinterpretation. Maintaining proper temperature control is particularly crucial for tests like the CBC, as the viability of white blood cells and the stability of various blood components can be affected by extreme temperatures. Storing specimens too cold, such as at temperatures nearing freezing (0-4 degrees Celsius) or below freezing (-20 degrees Celsius), can damage the cells, leading to hemolysis or altered cell counts. Conversely, temperatures above the recommended range can promote bacterial growth and compromise the sample’s integrity. Thus, the 2-10 degrees Celsius range is optimal for preserving the quality of the sample until it can be processed in the laboratory.