Importance of the Laboratory in todays clinical settings. Because all test orders eventually pass through it, the laboratory is in a unique position to contribute to the discussion of medical necessity, both from a test-volume standpoint and from the scientific aspects of test design and applicability. Because the determination of medical necessity also relies on medical history and clinical follow-up, however, laboratory data must be integrated in some meaningful way with information from physicians and from allied healthcare personnel if it is to be practical. Thus, any discussion of "medical necessity" must begin with a formal definition, in the clinical setting, of just what the term means. The definition will often include not only the utility of a specific test in a particular clinical setting, but also how often it should be used and when follow-up is needed.
Laboratories today are becoming indispensable in the field of medical sciences. Physicians today utilizes the laboratory in the management and treatment of diseases. The necessity of laboratory test is crucial because of the proliferation now of multiple drug resistant strains of bacterias and viruses and even parasites. Markers for certain cancers are identified in the lab using genetic testing.

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