In the context of reference intervals, what is the purpose of validating an adopted RI before clinical use?

• A. To ensure accuracy in the local laboratory population
• B. To compare to peer‑reviewed literature
• C. To verify instrument calibration
• D. To adjust units

Answer: (A)

Reference intervals are built for specific populations and testing methods, so validating an adopted RI in your own lab ensures it truly applies to your patients with your instrument and procedures. This verification confirms that the established interval appropriately represents the local healthy population, so clinical decisions based on the RI are accurate. If the adopted interval doesn’t hold up in validation, using it could misclassify normal animals as abnormal or miss true abnormalities, necessitating adjustment or a locally derived RI. Relying solely on literature without local validation ignores differences in populations and assay performance; instrument calibration and unit reporting are important too, but they address separate aspects of lab accuracy rather than whether the interval is applicable to your cases.