What blood specimens protected from light?

Blood specimens that need protection from light typically include those for tests measuring bilirubin, vitamin B2 (riboflavin), and certain porphyrins. Exposure to light can degrade these analytes, leading to inaccurate results. To prevent this, specimens are often stored in amber-colored tubes or wrapped in aluminum foil until analysis. Proper handling ensures the integrity of the samples and the reliability of test results.