Which of the following is NOT one of the major areas of testing in urinalysis?

In urinalysis, the major areas of testing typically encompass physical, chemical, and microscopic examinations. Each of these areas provides critical information about a patient's health and can indicate various medical conditions.

The physical examination assesses attributes such as color, clarity, and specific gravity of the urine. This initial step can reveal hydration status and other important health indicators.

The chemical analysis involves testing for various substances within the urine, such as glucose, protein, ketones, and pH levels. These tests help identify metabolic and systemic disorders.

The microscopic analysis is done by examining urine sediments under a microscope to detect cells, crystals, and bacteria, contributing valuable insights into potential infections or kidney issues.

"Diagnostic," on the other hand, does not refer to a specific area of testing in urinalysis. While urinalysis can play a role in the diagnostic process for various medical conditions, it is not classified as a major area of testing in the same way the other three are. Therefore, it is correct to identify "Diagnostic" as not being one of the major areas of testing within urinalysis.