The recommended calibration frequency is determined by which guidance?

• A. Local health department
• B. Federal guidelines
• C. Manufacturer's specifications
• D. Industry trade association

Answer: (C)

Calibration frequency is driven by how the instrument behaves over time, and the manufacturer tests that behavior to specify how often recalibration should be performed to maintain accuracy. Following those specifications keeps the instrument within its validated performance range and ensures data quality. Local health departments or federal guidelines may set overall requirements, and industry groups may offer best-practice advice, but the exact recommended interval comes from the device’s manufacturer.