Abstract
Establishing stability at all stages of a sample's lifespan is a critical part of performing regulated bioanalysis. For plasma assays, this includes the duration between when blood is drawn and when that blood is centrifuged to produce plasma. Here, we provide a discussion of current regulatory expectations around whole blood stability testing for LC-MS plasma assays, as well as the two primary experimental approaches utilized to assess whole blood stability. Next, we interrogated a large dataset of validated methods (1076 methods, the vast majority of which were for measurement of small molecules) to assess the correlation between whole blood and plasma stability profiles, finding them to be highly correlated. Finally, we summarize unique case studies; we have encountered during WB stability testing which offer lessons that may be broadly applicable.
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