18. A phlebotomist has collected a lactic acid sample and needs to prepare the sample for processing and transportation. Which of the following methods is correct?
Answer: A
Chill the sample.
Chilling the lactic acid sample is crucial to prevent metabolic processes that could alter the test results. This method ensures the integrity of the sample during transportation and processing.
A) Chill the sample.
Chilling the sample is the correct method as it effectively slows down metabolic activity, which can cause an increase in lactic acid levels if not managed properly. This step is essential for maintaining the sample's stability until it reaches the laboratory.
B) Protect the sample from light.
While protecting samples from light is important for certain tests, it is not specifically necessary for lactic acid samples. Lactic acid does not degrade significantly due to light exposure, making this option incorrect in this context.
C) Attach a heat block to the sample.
Using a heat block is inappropriate for lactic acid samples because heat can accelerate metabolic processes, which may lead to falsely elevated lactic acid levels. Therefore, this option is incorrect.
D) Freeze the sample.
Freezing a lactic acid sample is not recommended as it can lead to hemolysis and alter the composition of the sample, potentially affecting test results. Thus, this option is also incorrect.
Conclusion
Chilling the sample is the definitive method for preserving the accuracy of lactic acid measurements, ensuring that metabolic changes do not interfere with the results. Other methods, such as protecting from light, using heat, or freezing, do not adequately address the stability requirements for lactic acid samples and could lead to inaccurate outcomes.