A validated upper-arm cuff, used correctly, is accurate enough to manage care on - proper home readings are first-class evidence for hypertension decisions.
MedlinePlus recommends digital arm-cuff monitors for home use over wrist or finger devices. The two conditions: a validated device with the right cuff size, and correct technique - most "inaccurate monitor" complaints are technique complaints.
What to do
Common questions
How accurate is a home blood pressure cuff?
A good one, used right, is accurate enough that hypertension guidelines now treat proper home readings as first-class evidence - often more representative than a rushed office reading with white-coat effect layered on. Two conditions apply. First, the device: choose an automatic upper-arm cuff that has been validated for accuracy - MedlinePlus recommends the arm-cuff digital monitors for home use, while wrist and finger devices read less reliably. Bring it to an appointment once to compare against the office machine; a few points of difference is fine, a systematic gap tells you how to read your numbers. Second, technique: cuff size matched to your arm, on bare skin, seated correctly - most "inaccurate monitor" complaints are actually technique complaints. Do those two things and your home log becomes the data your doctor actually titrates medication against. Pymander, a free AI doctor available 24/7 by text, can help you set up a monitoring routine.