Start with the right monitor
An automatic, upper-arm cuff is recommended for home use. Check the cuff fits their arm (cuffs come in sizes), and look for a monitor that has been validated for accuracy — in the US you can check the list at validatebp.org. Bring the monitor to their next appointment so the doctor or nurse can check it.
Help them build a simple routine
Take readings at the same times each day, for example morning and evening; sit quietly for 5 minutes first; take 2–3 readings a minute apart. See How to take your blood pressure at home for the step-by-step routine and Morning vs evening blood pressure: when to measure.
Keep one log
One place for every reading makes appointments easier. Read How to keep a blood pressure log for your doctor for what to record.
Know the warning signs
Medicines: support, don't adjust
Reminders and a simple way to mark doses taken help with consistency. Never change or stop a medicine because of one reading — share the log with their doctor and decide together.
Respect their independence
Ask before you start following their numbers, let them choose what to share, and agree on when you'll check in. Encouragement works better than nagging.
How FourNumbers helps families
Your parent logs on their own iPhone, and you follow along on yours — no need to type in their readings for them. Your parent invites you to their Care Circle from the app. They choose who's in it and can remove anyone at any time. On the free plan you can see their recent meals; with FourNumbers Premium you can also see their blood pressure and medications and get a gentle alert if a reading is much higher than their usual, so you can check in. You can send encouraging notes. FourNumbers doesn't monitor anyone in real time — in an emergency, always call 911.
Download on iPhoneSources: American Heart Association; Validated device listing.