When the physical and chemical characteristics of body substances are within acceptable range is called ___________

• A. Reference range
• B. Laboratory test
• C. Waived test
• D. Qualitative test

Answer: (A)

The concept being tested is reference range—the set of values considered normal for a given test in a healthy person. When a patient’s physical and chemical characteristics fall within this range, the result is interpreted as normal or acceptable. Reference ranges come from measurements in large groups of healthy individuals and act as a baseline to judge whether a result is typical or may indicate an issue. The other terms describe the test itself or the type of result rather than what’s considered normal: a laboratory test is the procedure used to measure something, a waived test refers to a simple, low-risk test category, and a qualitative test reports a positive/negative or present/absent result rather than a numeric range.