What is the maximum time limit for processing a blood specimen after collection?

The maximum time limit for processing a blood specimen after collection is typically two hours. This is critical for preserving the integrity of the sample and ensuring accurate test results. Blood specimens can undergo changes over time due to factors like cellular metabolism, which can alter the composition of the sample. Specifically, certain analytes may degrade or change in concentration if the specimen is not processed promptly.

Processing within this two-hour window minimizes these changes, particularly for tests related to chemistry or hematology. For example, delayed processing can lead to changes in electrolyte levels or affect the viability of cells in the specimen, ultimately impacting diagnostic accuracy. Therefore, adhering to this time frame is essential in a clinical laboratory setting to ensure that results are reliable and reflective of the patient’s true state at the time of collection.