How to Read BP Machine Numbers: Systolic, Diastolic and Pulse

A home BP machine shows three numbers: systolic (the top number), diastolic (the bottom number) and pulse. Systolic is the pressure when your heart beats; diastolic is the pressure when it rests between beats. The two are written like 120/80 mmHg. Read them together, and record several readings over time, not one.

What do the numbers on a BP machine mean?

Most home blood pressure monitors show three values on the screen after each measurement. They are easy to tell apart once you know where to look.

• Systolic (SYS) — the top number. It is the pressure in your arteries when your heart beats.
• Diastolic (DIA) — the bottom number. It is the pressure in your arteries when your heart rests between beats.
• Pulse — how many times your heart beats in one minute, shown as BPM.

Omron's published materials describe systolic pressure as the highest pressure in the blood vessels when the heart contracts, and diastolic pressure as the lowest pressure between heartbeats. A full reading is written as systolic over diastolic, for example 120/80 mmHg.

What is systolic blood pressure on a BP machine?

Systolic pressure is the first and higher number in a reading. It measures the force your blood places on artery walls at the moment your heart beats and pushes blood out.

The World Health Organization (WHO) describes blood pressure as the force of circulating blood against the walls of the body's arteries. Systolic pressure is the peak of that force during each heartbeat, so it tends to move more than the diastolic number during the day.

On the display you will usually see it at the top left, labelled SYS or with a heart symbol beside it. The number alone is not a verdict on your health — it becomes meaningful to a professional when it is one of several readings taken over time.

What is diastolic blood pressure?

Diastolic pressure is the second and lower number. It measures the pressure in your arteries while your heart is resting and filling with blood between beats.

It is written after the slash: in 120/80 mmHg, 80 is the diastolic value. On the monitor screen it is usually labelled DIA and sits directly below the systolic number.

Both values are used together. As Omron's blood pressure diary notes, systolic and diastolic values are both necessary for a healthcare professional to evaluate the status of your blood pressure.

What is the pulse number on a BP machine?

The pulse reading shows your heart rate in beats per minute. It appears next to a heart symbol or the letters BPM or PUL.

For the Omron HEM-7142T2, the instruction manual lists a pulse measurement range of 40 to 180 beats per minute. Your pulse can change with movement, stress, caffeine and the time of day, so compare it against readings taken in the same calm conditions.

Some monitors also display an irregular heartbeat symbol when the rhythm varies during measurement. That symbol is a prompt to share your record with a health professional — it is not a diagnosis of any condition.

What does mmHg mean on a blood pressure monitor?

mmHg stands for millimetres of mercury, the standard unit used to express blood pressure. Both the systolic and diastolic numbers are given in mmHg.

The unit is a holdover from mercury column gauges, but digital monitors keep it so readings stay comparable with clinical equipment. Pulse is not measured in mmHg — it is shown in beats per minute.

How do I take a correct BP reading at home?

Technique changes the numbers on the screen as much as anything else. Omron's instruction manual for the HEM-7142T2 lists the preparation steps below, and the same routine applies to most home monitors:

• Avoid bathing, drinking alcohol or caffeine, smoking, exercising and eating for at least 30 minutes before measuring.
• Rest quietly for at least 5 minutes before the measurement, in a quiet room at a comfortable temperature.
• Remove tight or thick clothing from the arm so the cuff sits on bare skin.
• Wrap the cuff 1 to 2 cm above the inside of the elbow, with the air tube aligned with your middle finger.
• Sit with your back supported, feet flat on the floor and legs uncrossed, with the cuff at heart level on a table.
• Remain still and do not talk during the measurement.
• Wait 2 to 3 minutes between repeated measurements before taking another reading.

What do the symbols on my BP monitor screen mean?

Modern monitors use small icons to tell you whether the measurement itself was done properly. Common ones include:

• Cuff wrap symbol — confirms the cuff is wrapped correctly. If it shows an error state, switch the monitor off and refit the cuff.
• Irregular heartbeat symbol — the Omron HEM-7142T2 manual states the monitor detects irregular heartbeats during measurement and indicates them with a symbol alongside the readings.
• Hypertension indicator — a symbol that appears when a reading is above the range the monitor is programmed to flag, as described in the product materials.
• Low battery symbol — time to replace the batteries before the next measurement.

These icons support correct measurement; none of them is a medical verdict. Only a qualified health professional can interpret what your readings mean for you.

When should I measure my blood pressure?

Omron's guidance for the HEM-7142T2 recommends measuring in the morning — within one hour of waking, before breakfast and after visiting the restroom — and again in the evening before bed. Keep the times roughly the same each day.

Stress raises blood pressure, so choose a calm moment and a quiet place. Keep a written or app-based record; readings shown to a health professional over time are more useful than any single measurement.

Why do my home BP readings change from day to day?

Blood pressure naturally varies with activity, stress, temperature, caffeine and even talking during measurement. The Omron manual is explicit that a single measurement does not provide an accurate indication of your true blood pressure.

Small differences between readings taken minutes apart are normal. If values look very different from your usual pattern, repeat the measurement after a short rest and show the full record to your health professional.

How do I read BP machine numbers on a phone?

Some monitors send readings to a phone over Bluetooth. The Omron HEM-7142T2 instruction manual specifies Bluetooth Low Energy for wireless communication, so readings can be transferred to a paired smart device.

In the app, each entry keeps the same three values — systolic, diastolic and pulse — usually with the date and time. A phone record makes it easier to bring a complete history to your next appointment.

How do I read blood pressure numbers at home?

Read the top number as systolic pressure, the bottom number as diastolic pressure, and the third value as pulse in beats per minute. Write the reading as systolic/diastolic with the pulse beside it, for example 120/80 mmHg, pulse 72. Take several readings under the same conditions and share the record with a qualified health professional.

What is a normal BP reading?

WHO states that, for most people, the goal is a blood pressure below 140/90 mmHg. WHO also states that hypertension is diagnosed when systolic readings are 140 mmHg or higher and/or diastolic readings are 90 mmHg or higher, measured on two different days.

Those figures are general public-health reference points, not a personal target. Your own numbers can only be interpreted by a qualified health professional who knows your full medical history.

Which number is more important, systolic or diastolic?

Health professionals read both numbers together rather than treating one as the only value that matters. Omron's blood pressure diary states that both systolic and diastolic values are necessary for a healthcare professional to evaluate the status of your blood pressure.

Record both numbers every time you measure. Trends in the pair are what give a professional something to work with.

Why does my BP machine show a heart symbol?

A flashing heart symbol usually indicates that a heartbeat was detected during measurement; an irregular heartbeat symbol means the monitor noticed a rhythm that varied during that reading. The Omron HEM-7142T2 manual describes this as a detection-and-indication feature, not a diagnosis.

Note the reading, the time and whether the symbol appeared, then show the record to your health professional if it keeps recurring.

Which arm should I use for a BP machine?

Omron's manual recommends always using the same arm, because blood pressure can differ between the right and left arm. The same manual advises asking a physician which arm to use if readings between both arms differ substantially.

Whichever arm you choose, keep the cuff at heart level and the arm supported on a table during every measurement.

This article is for general information only and is not medical advice. Diagnosis, treatment and medication decisions must come from a qualified health professional. Product specifications and prices are taken from Bikarok's published catalogue and may change; check the product page for the current listing before buying.