Blood Pressure 173 over 53 - what do these values mean?
No. 173/53 is in the range of hypertension stage 2 (grade 2). If confirmed, it needs treatment — usually medication plus lifestyle changes. Its lower number is low on its own, though — see below.
- International (ESH)Hypertension stage 2
- US guideline (AHA/ACC)Stage 2 hypertension
- Pulse pressure120 mmHg
- Mean arterial pressure93 mmHg
What to do now
- See your doctor soon — within a week or two.
- Treatment usually starts promptly with medication (often two drugs in one pill) plus lifestyle changes.
- Keep a home log to bring to the appointment.
The systolic (upper) number decides the category: when the two numbers fall into different categories, the higher one counts. Your lower number of 53 is low on its own (diastolic below 60), and the gap of 120 mmHg between the two numbers is wide — mention it to your doctor, sooner if you feel dizzy or faint. This pattern — high systolic, normal or low diastolic — is called isolated systolic hypertension and is common after 50.
Blood pressure 173/53 on the blood pressure chart
- Low blood pressure
- Ideal (optimal)
- Normal
- High normal
- Hypertension stage 1
- Hypertension stage 2
- Hypertension stage 3
Read more about this category: Hypertension stage 2.
International and US categories
| Category | Systolic / diastolic (mmHg) | US (AHA/ACC) |
|---|---|---|
| Ideal (optimal) | < 120 and < 80 | Normal |
| Normal | 120–129 and/or 80–84 | Elevated / stage 1 |
| High normal | 130–139 and/or 85–89 | Stage 1 |
| Hypertension stage 1 | 140–159 and/or 90–99 | Stage 2 |
| Hypertension stage 2 | 160–179 and/or 100–109 | Stage 2 |
| Hypertension stage 3 | ≥ 180 and/or ≥ 110 | Stage 2 / severe > 180/120 |
| Low blood pressure | systolic < 90 or diastolic < 60, the other number not raised | Low |
International categories: European Society of Hypertension (ESH) 2023, office readings. Home readings use lower thresholds — hypertension from an average of 135/85. A reading with one raised and one low number counts by the raised one.
Pulse pressure and mean arterial pressure
A pulse pressure of 120 mmHg is wide (above 60). In older adults it usually reflects stiffer arteries. Mean arterial pressure — the average pressure perfusing your organs — is about 93 mmHg, within the typical range of about 70–100.
Measure it right
- No caffeine, exercise or smoking for 30 minutes; empty your bladder.
- Sit with back supported, feet flat, for 5 minutes. Don't talk.
- Upper-arm cuff of the right size on bare skin, arm supported at heart level.
- Two readings a minute apart, morning and evening, for 7 days — use the average.
Details: Measuring Blood Pressure Correctly: Step by Step
Check another reading
Nearby readings
Sources: ESH 2023 guideline (international categories) · AHA/ACC 2025 guideline (US categories, unchanged from 2017) · MedlinePlus: Low blood pressure. Reviewed by the BloodPressureOK editorial team · last reviewed October 25, 2026.
This page explains one reading in general terms. High blood pressure is diagnosed from repeated measurements. Not medical advice — talk to your doctor about your readings.