This approachable how-to guide focuses on the most commonly encountered profiles in everyday healthcare practice, regardless of specialty, making it the ideal introduction for PAs, nurses, NPAs and medical students embarking on their healthcare education, as well as residents, fellows, and practicing clinicians looking for a fast refresher. Straightforward, clinically oriented coverage walks users through selecting and employing the right diagnostic tests from the thousands available, accompanied by engaging case studies that strengthen clinical reasoning and streamline the effective application of lab results in the clinical decision-making process.