Prepare Smarter for the Phlebotomy-Technician Exam

Light exposure can cause a preanalytic error for serum bilirubin because bilirubin is light-sensitive. If a bilirubin specimen is exposed to light for too long, photodegradation can occur, leading to falsely decreased bilirubin results. This is why bilirubin specimens are commonly protected from light by using an amber container or wrapping the specimen in foil according to facility procedure. “Population” is not a specimen-handling variable that directly causes bilirubin degradation. “Pollutants” is too vague and does not identify the specific preanalytical issue tested here. “Location” may matter for collection site selection in some contexts, but it is not the classic handling error for bilirubin. The phlebotomist must know which specimens require special handling for light, temperature, time, transport, and processing. Failure to protect light-sensitive analytes can compromise specimen integrity before testing even begins, producing inaccurate laboratory results despite correct venipuncture technique. The NHA CPT outline directly includes maintaining specimen integrity based on handling requirements such as temperature, light, and time, as well as recognizing the impact of preanalytical errors on test results. Reference topics: Processing Specimens; bilirubin handling; light protection; preanalytical error.

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