Question 51

Bilirubin is a photosensitive blood specimen test that should be protected from light during handling and transport.

Bilirubin is known to be sensitive to light, which can cause its degradation and lead to inaccurate test results. Therefore, it must be protected from light exposure throughout the handling and transport process to ensure the integrity of the sample.

A) Gastrin

Gastrin is not a photosensitive test and does not require protection from light during handling and transport. This hormone's stability is not affected by light exposure, making it safe to handle without special precautions regarding light.

B) Ammonia

Ammonia levels in blood specimens are also not affected by light exposure. While care must be taken to handle ammonia specimens correctly to avoid contamination, light protection is not necessary for this test.

C) Pyruvate

Pyruvate testing does not require light protection, as it is not photosensitive. Although pyruvate levels can be influenced by other factors, light does not play a role in altering its stability.

D) Bilirubin

Bilirubin is indeed a photosensitive substance and must be protected from light to prevent its breakdown. Exposure to light can lead to inaccurate measurements, which is why special handling protocols are necessary for this test.

Conclusion

Bilirubin is the only test among the options that requires protection from light due to its photosensitivity, making it the correct answer. The other options—gastrin, ammonia, and pyruvate—do not have the same light sensitivity, and therefore, they do not necessitate light protection during handling and transport. This highlights the importance of understanding specimen handling guidelines to ensure accurate laboratory results.