Which analyte must be stored at 2-8C?

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Multiple Choice

Which analyte must be stored at 2-8C?

Storing a sample at 2-8°C is about keeping the specimen’s components from changing due to ongoing metabolic or chemical processes after collection. Total cholesterol is the analyte in this set that is routinely kept cold to preserve lipid integrity until testing, preventing oxidation or enzymatic changes that could alter the measured value if the sample sits at room temperature. Ammonia, lactate, and PTH each have their own stricter or different handling needs—ammonia is very labile and often must be kept on ice and analyzed quickly; lactate levels can rise with ongoing glycolysis and also require rapid cooling; PTH stability can require specific handling or freezing for long-term storage. In this context, refrigeration is specifically indicated for preserving cholesterol measurements.

Storing a sample at 2-8°C is about keeping the specimen’s components from changing due to ongoing metabolic or chemical processes after collection. Total cholesterol is the analyte in this set that is routinely kept cold to preserve lipid integrity until testing, preventing oxidation or enzymatic changes that could alter the measured value if the sample sits at room temperature. Ammonia, lactate, and PTH each have their own stricter or different handling needs—ammonia is very labile and often must be kept on ice and analyzed quickly; lactate levels can rise with ongoing glycolysis and also require rapid cooling; PTH stability can require specific handling or freezing for long-term storage. In this context, refrigeration is specifically indicated for preserving cholesterol measurements.

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