Blood samples begin degrading immediately after being drawn, and this degradation can lead to laboratory errors. The preanalytical phase, which includes collection, handling, transport, and storage, is a critical period where most errors occur. Issues such as hemolysis from a rough draw, mislabeled tubes, or delayed transport can compromise a sample, often resulting in a plausible-looking but incorrect result.
The impact of these issues varies depending on the type of test being run. For example, a complete blood count is generally more forgiving and can withstand room temperature for a day or so. Other tests, however, may be more sensitive to these factors.
Further details on laboratory errors and the challenges of working with blood samples are available from the source.
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