Which phase of laboratory testing includes test orders and sample preparation?

The phase of laboratory testing that includes test orders and sample preparation is the pre-analytical phase. This phase is crucial as it involves all the steps taken before the actual testing of specimens begins. During this phase, healthcare professionals discuss and finalize test orders, ensuring the right tests are selected based on the clinical needs. Additionally, sample preparation, including labeling, collecting, and sometimes processing the specimens (like centrifuging blood), occurs during this phase.

Understanding the pre-analytical phase is essential, as it significantly impacts the quality and accuracy of test results. Proper management of this phase helps to minimize errors that could affect patient diagnosis and treatment. The analytical phase follows this and involves the execution of the laboratory tests themselves, while the post-analytical phase concerns the interpretation and reporting of results. The term "diagnostic" is broader and does not pertain specifically to any single phase of laboratory testing.