Clinical Laboratory Tests: Which, Why, and What Do The Results Mean?

According to Dr. Michael Laposata, the medical speciality that nearly every practicing physician relies on every day, for which training in many medical schools is limited to no more than a scattered few lectures throughout the entire curriculum, is "laboratory medicine." The importance of understanding the principles for selecting and ordering the most rational laboratory test(s) on a specific patient is heightened in the current age of managed care, medical necessity, and outcome-oriented medicine. The days of a "shotgun approach" to ordering laboratory tests has, of necessity, been replaced by a "rifle" (or targeted) approach based on an understanding of the test's diagnostic performance and the major "legitimate" reasons for ordering a laboratory test. Such an understanding is critical to good laboratory practice and patient outcomes.