Office blood pressure measurement — the cornerstone of hypertension diagnosis for over a century — has significant limitations: white coat effect (temporarily elevated BP in clinical settings) artificially inflates readings in 15–20% of patients, while masked hypertension (normal office BP but elevated ambulatory BP) underlies 15–20% of cardiovascular events in "normotensive" patients. Ambulatory blood pressure monitoring (ABPM) — the patient wears a device taking readings every 15–30 minutes over 24 hours — is now recognized as the most accurate method for hypertension diagnosis and treatment evaluation.
What ABPM Reveals That Office Measurement Misses
White coat hypertension: office BP ≥140/90, but 24-hour ABPM average < 130/80 mmHg — found in ~20% of patients with elevated office BP. Long-term cardiovascular risk is intermediate between true hypertension and normotension, but substantially lower than sustained hypertension. Avoiding overtreatment of white coat hypertension could prevent significant medication burden and adverse effects. Masked hypertension: office BP < 130/80 but ABPM ≥130/80 daytime or ≥120/70 nighttime — prevalence 10–15% in "normotensive" clinic patients. Carries cardiovascular risk comparable to sustained hypertension; ABPM is the only reliable detection method. Nocturnal dipping: BP normally falls 10–20% during sleep ("dippers"). Non-dippers and reverse-dippers (BP rises during sleep) have significantly higher CVD risk independent of overall BP level — a finding only ABPM can capture. For clinical facilities measuring blood pressure and managing hypertension, our diagnostic equipment section includes clinical-grade sphygmomanometers, digital BP monitors, and blood pressure cuffs across patient sizes.
