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Blood pressure measurement

Blood pressure measurement is a central medical examination method that can be performed not only by doctors but also by healthcare professionals such as registered nurses, medical assistants, or paramedics.

To measure blood pressure, it is important to have the right knowledge in order to obtain accurate and reliable values. In addition, if blood pressure readings deviate and are therefore sometimes life-threatening, appropriate measures can be initiated.

Blood pressure measurement on the upper arm and wrist
The usual method of measuring blood pressure is known as the indirect method. A cuff is placed around the upper arm and slowly inflated, either manually or automatically using digital measuring devices. At a certain point, the pressure in the cuff is approximately equal to the pressure in the artery. If the pressure is then increased slightly, the brachial artery is compressed. Blood flow is briefly interrupted at this point. The pulse caused by the beating of the heart muscle can no longer be heard or felt. In this way, a blood pressure gauge can be used to determine the blood pressure in a medium-sized artery in the arm or leg. A stethoscope helps make the measurement method more precise by supplementing visual detection with auditory perception. Using a stethoscope, the examiner can hear exactly when the pressure in the cuff compresses the artery.

Illustration: Measurement using the Korotkoff method

1. The cuff is put on. 1. The cuff is put on.
2. The cuff is inflated until it stops the blood flow. 2. The cuff is inflated until it stops the blood flow.
3. As the air is released, the oscillations in the blood flow are recorded. 3. As the air is released, the oscillations in the blood flow are recorded.
4. When the blood flows again without turbulence, the measurement is finished. 4. When the blood flows again without turbulence, the measurement is finished.

Illustration: Measurement with an oscillometric device

1. The cuff is put on. 1. The cuff is put on.
2. The cuff is inflated until it stops the blood flow. 2. The cuff is inflated until it stops the blood flow.
3. As the air is released, the oscillations in the blood flow are recorded. 3. As the air is released, the oscillations in the blood flow are recorded.
4. When the blood flows again without turbulence, the measurement is finished. 4. When the blood flows again without turbulence, the measurement is finished.


Two values are always distinguished in a blood pressure measurement. On the one hand there is the so-called systolic blood pressure. It describes the maximum pressure during the heart's contraction phase. On the other hand the diastolic blood pressure is measured, which is the pressure during the heart's relaxation phase.

The measured values are compared with the corresponding normal values. The blood pressure of a young, rested, healthy adult is about 120/80 mmHg. The higher value of 120 mmHg is the systolic blood pressure. The lower value of 80 mmHg is the diastolic blood pressure.

The older a person gets, the higher their blood pressure tends to be. This is caused by a natural loss of elasticity in the blood vessels, but it can also be caused by various diseases.

In another, very specialized method of measuring blood pressure-the direct arterial blood pressure measurement-a catheter is inserted directly into an artery, and the blood pressure is measured close to the heart. This measurement is performed mainly during operations or in intensive care units.

Sources:


This article is from Tensana – the leading app since 2011, helping hundreds of thousands of people monitor their blood pressure every day. Our content is based on carefully researched, evidence-based data and is continuously updated (as of 11/2025).

Author Sabine Croci is a qualified medical assistant with many years of experience in internal medicine and cardiology practices as well as outpatient care, and has headed the specialist editorial team at Tensana since 2015. Thanks to her extensive additional qualifications as an emergency medical technician, first responder, and in various areas of therapy and emergency care, she provides well-founded, practical, and reliably verified information.

We hope you found the article helpful. Accurate measurements are essential for good blood pressure control. Our app Tensana can help with that. Clear instructions walk you through taking measurements according to current guidelines. The app can also remind you if you wish. These features are fully available in the free version as well. Get the free app now.


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