What is the purpose of calibration checks on a sphygmomanometer?

• A. To verify accuracy against a known standard
• B. To adjust readings to the clinician’s expectation
• C. To replace the zeroing function
• D. To measure cuff compliance only

Answer: (A)

Calibration checks verify that a sphygmomanometer measures pressure accurately by comparing its readings to a known, traceable standard. Over time, components can drift, seals may loosen, or temperature changes can affect accuracy, so regular calibration ensures the device still reflects true arterial pressure. This is about objective accuracy, not fitting readings to what a clinician expects, and it goes beyond just zeroing because it tests the instrument across its measurement range. It also isn’t about cuff properties; cuff compliance affects how pressure is transmitted, not the instrument’s measurement accuracy. By confirming readings match the standard, clinicians can trust the numbers for correct diagnosis and treatment.