Understanding Your Parent's Blood Pressure Numbers

Blood pressure is the vital sign families see most and understand least. Paramedics take thousands of readings a year, so here's the plain-English version of what those two numbers mean, how to measure them properly at home, and when a number should prompt a call.

The two numbers, simply

The top number (systolic) is the pressure when the heart beats. The bottom (diastolic) is the pressure between beats, when the heart rests. Think of a garden hose: the top number is the surge when you squeeze the trigger; the bottom is the standing pressure in the hose.

What the ranges mean

• Under 120/80 — normal territory
• 120–129 systolic — elevated; worth watching
• 130–139 / 80–89 — stage 1 high blood pressure
• 140+/90+ — stage 2; the doctor should be involved and probably already is
• 180+/120+ — a crisis range: re-check in a few minutes; with symptoms like chest pain, shortness of breath, vision change, or weakness, call 911

For older adults, targets are individual — some seniors feel dizzy or fall when pressure is driven too low. The right target is a conversation with their doctor, not a chart on the internet.

Why home readings beat office readings

Many people run high at the doctor's office ("white coat" effect) and normal at home — or the reverse, which is sneakier and more dangerous. Home measurements, taken correctly and consistently, give the doctor far better data than one reading every few months.

How to measure it right

1. Sit quietly for 5 minutes first — no caffeine or exertion for 30 minutes before
2. Feet flat on the floor, back supported, arm resting at heart height
3. Cuff on bare skin, correct cuff size (too small reads falsely high)
4. Take two readings a minute apart, same time each day, and write them down

The real power: the trend line

One high reading after a stressful morning means little. A month of readings drifting upward means a lot. That's the principle behind Salus vital signs monitoring — professional measurements, tracked visit to visit, with changes flagged to your family and their physician while they're still easy to address.

This article is general education, not medical advice. Always consult your loved one's physician about their specific health situation. In an emergency, call 911.