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What is a Sphygmomanometer?

A sphygmomanometer is a blood pressure measuring device. It's made out of an inflated rubber cuff that wraps over your arm. The pressure of the cuff is shown via a measuring device. The cuff is inflated by a bulb, and the pressure is released via a valve. A stethoscope is used to listen to the sounds of arterial blood flow.

As the heart beats, blood pumped through the arteries causes a rise in pressure, known as systolic pressure, followed by a reduction in pressure as the ventricles of the heart prepare for another beat. This low pressure is referred to as the diastolic pressure.

What is the importance of a Sphygmomanometer?

To accurately diagnose hypertension, it is critical to be well-trained in blood pressure measuring methods and to have an accurate, dependable device. And  a Sphygmomanometer is the most accurate device to measure blood pressure.

Types of a Sphygmomanometer

There are three types of sphygmomanometers used to measure human blood pressure.

  • Mercury sphygmomanometer. Mercury sphygmomanometer is a conventional and time-tested way of measuring blood pressure.
    The device is made up of an inflated bladder and a mercury column. Various mercury levels in the column are caused by different pressures. Once the column is made, it is not necessary to recalibrate it to their exact specifications.
  • Aneroid Sphygmomanometer. The aneroid sphygmomanometer is a device comprised of a spring mechanism and a metal membrane that transforms the signals from the cuff and controls a needle in the gauge. It stands on the stans or walls. Because there is no liquid present, this gadget may be readily transferred from one area to another. Because these devices require calibration checks, the findings are imprecise. Before using the needle, it must be kept at zero. Calibrations are performed on a regular basis to ensure accurate findings.
  • Digital Sphygmomanometer. The digital sphygmomanometer comes in useful when you want to test your blood pressure at home without any preparations, including diastolic and systolic blood pressure. Simply insert the rubber node into the monitor's hole and wrap the cuff over your upper arm; when you press the button, it will measure your blood pressure and heart rate using oscillometric detection. The monitor has an audio device that will inform you of the results in accordance with WHO guidelines. It is portable and convenient, that it can be charged, and that we can check average results.

Parts of a Sphygmomanometer

  1. Bladder:  It's an inflatable bag that squeezes the arms and blocks the artery when filled.
  2. Cuff:  An inflated rubber bladder is encased in the cuff and wraps around the upper arm. The pressure in the cuff is measured with a pressure metre.
  3. Valve: The deflation valve is necessary for accurate measurement since it allows for regulated deflation of the cuff. A check valve  stops air from escaping.
  4. Bulb:  The blood pressure within the cuff is inflated using a tiny, portable air pump.
  5. Manometer: It is the part of the sphygmomanometer that measures blood pressure in (mmHg). The air pressure delivered to the cuff is measured by this aneroid gauge, which has a watch-like movement. Within the gauge, a series of diaphragms (copper or beryllium) expand as air is filled, and gears transform the linear motion of the diaphragms, moving the needle on a dial calibrated in (mmHg).

How Does a Sphygmomanometer Work?

Blood pressure cuffs are placed around the upper arm's circumference, targeting the brachial artery, and inflated considerably over the patient's predicted systolic pressure before being allowed to deflate.

Blood begins to flow beyond the cuff when the cuff pressure equals the artery pressure, causing audible Korotkoff sounds. These are monitored with a stethoscope and will continue until the cuff pressure falls below the patient's diastolic blood pressure.

Blood pressure readings are recorded as "systolic over diastolic." As an example, 120 (systolic) over 70 (diastolic).

Usage of a Sphygmomanometer 

A sphygmomanometer is used to create a service line at a healthcare meet and during hospital admission. Blood pressure checks are also performed to monitor the efficacy of medications and other ways for controlling hypertension, as well as as a diagnostic tool for detecting different illnesses and anomalies.

The following are details of uses of three different types of sphygmomanometers:

  1. Aneroid Sphygmomanometer. This device is widely used by medical professionals and health practitioners.
  2. Mercury Sphygmomanometer. They are employed in all pharmaceutical and medical institution clinical tests, as well as clinical judgements, in order to assess blood pressure in high-risk patients and pregnant women.
  3. Digital Sphygmomanometer. Specific healthcare practitioners use digital for screening but mercury sphygmomanometers to confirm findings in some cases due to unreliable results.

How Should a Sphygmomanometer Be Used?

  • To begin measuring blood pressure, use a right size blood pressure cuff. The total length of the cuff should be at least 80 percent of the circumference of the upper arm.
  • Wrap the cuff over the upper arm, with the lower border of the cuff one inch above the antecubital fossa.
  • Gently place the stethoscope's bell slightly below the cuff's border over the brachial artery. Because some health care personnel have trouble utilising the bell in the antecubital fossa, we recommend measuring blood pressure with the bell or the diaphragm.
  • Inflate the cuff quickly to 180mmHg. Release air from the cuff at a slow (3mm/sec) speed.
  • Use the stethoscope to listen while simultaneously observing the dial or mercury gauge. The subject's systolic pressure is indicated by the first banging sound (Korotkoff). When the banging sound stops, the diastolic pressure is reached.
  • Take note of the pressure differences in both arms, as well as the subject's position (supine), which arm was utilised, and the cuff size (small, standard or large adult cuff).
  • If the subject's blood pressure is high, test blood pressure twice more, waiting a few minutes between readings.
  • A blood pressure of 180/120 mmHg or higher requires immediate attention.

How do I Interpret Data from a Sphygmomanometer?

Blood Pressure CategorySystolic mm HgDiastolic mm Hg
NormalLess than 120Less than 80
High Blood Pressure (Hypertension) Stage 1140-15990-99
(Hypertension) Stage 2160 or higher100 or higher

Hypertension Crisis

(Emergency medical attention is required.)

Higher than 180Higher than 110


  • Although views are different, a normal blood pressure reading is 120/80 (systolic/diastolic).
  • Prehypertension is indicated by systolic readings of 120 to 139 and diastolic readings of 80 to 89.
  • You may have stage I hypertension if your systolic is between 140 and 150 and your diastolic is between 90 and 99.
  • If your systolic blood pressure is over 160 and your diastolic blood pressure is over 100, you have stage II hypertension.
  • Stage III hypertension is defined as a systolic blood pressure of 180 or more and a diastolic blood pressure of 110 or more.

There are several factors that might cause you to get a misleading reading. Try not to get panic by a single high reading unless it's 180/110. Even so, you should retest at least once.

It may be great if you've been doing something strenuous, like working out or playing sports. It will be greater than normal if you've been eating salty foods or using stimulants (coffee, ADD medication). 

Take another reading after adjusting the cuff. If it doesn't come down after a few hours, contact a medical expert.

Low readings may indicate that you should retest, but if they're correct, you should only be concerned if your doctor has advised you to or if you feel lightheaded. 


  • Aneroid and digital manometers may need to be calibrated on a regular basis.
  • On obese or highly muscled people, use a bigger cuff.
  • For paediatric patients, use a smaller cuff.
  • A lower blood pressure in children may suggest the existence of hypertension.
  • Don't wear the cuff over your clothes, and make sure the subject's arm is flexed and supported.

How to read the sound of Korotkoff?

When a blood pressure cuff affects the flow of blood via an artery, Korotkoff sounds are produced. A stethoscope or a doppler positioned distal to the blood pressure cuff is used to listen for these noises.

As the systolic pressure is reduced, the Korotkoff noises cease in some people. The Korotkoff noises resurface after a brief pause. The "auscultatory gap" is the term for this time span.

The "auscultatory gap" is the term for this time span. If the cuff pressure is not increased enough, this pathophysiologic event might result in a significant underestimation of systolic pressure. The quick inflation of the blood pressure cuff to 180mmHg was advised above for this reason.

In individuals with high blood pressure, the "auscultatory gap" is thought to be linked to carotid atherosclerosis and a reduction in arterial compliance.

Consider These Factors When Choosing the Best Sphygmomanometer

  1. Build Quality. Sphygmomanometers are mostly made of the same components, including nylon cuffs, tubing, bulb pumps, and metal gauges. However, depending on the instrument's design and build quality, the accuracy and overall quality might vary greatly.
  2. Reading Accuracy. When choosing the finest sphygmomanometer for you, accuracy should be a main consideration. 
  3. Brand. The manufacturer of a sphygmomanometer, like any other product, has a significant influence on its quality. As a result, you should only get one from a reliable company that has a lot of positive manual blood pressure cuff reviews.
  4. Fit. A sphygmomanometer should be able to comfortably suit a wide range of people while consistently obtaining accurate blood pressure readings. The majority of models suit arms with a diameter of 9-14 inches, while others are created specifically for children or people with wider arms.
  5. Hypoallergenic Properties. A decent blood pressure monitor should be hypoallergenic and built of latex-free materials.

Best Sphygmomanometers in India

Rossmax Aneroid Sphygmomanometer BP Apparatus GB101

It consists of a rubber cuff that inflates and wraps around the arm. The pressure of the cuff is shown via a measuring device. The cuff is inflated by a bulb, and the pressure is released via a valve. The sounds of arterial blood flow are heard with a stethoscope. 1 BP Apparatus, 1 Normal Cuff, and a User Manual are included. An aneroid sphygmomanometer that has been properly maintained is an accurate and therapeutically relevant method of measuring blood pressure indirectly.

Key Features:

  • Features a black enamel 300mmHg non-stop pin dependable manometer 
  • For use on the arm, providing extremely rapid and precise results.
  • Spill proof design
  • Maintains calibration even after accidental drop.
  • Each side has four layers of insulation for maximum comfort and safety.
  • A built-in double thermostat ensures complete safety.
  • Ultra soft washable cotton cover

Diamond Clock Type Sphygmomanometer BP Apparatus

The Diamond Clock Type Blood Pressure Monitor is a Sphygmomanometer that is simple to operate. The Diamond Clock Type Sphygmomanometer BP Apparatus monitors systolic and diastolic blood pressure as well as arterial pressure. The machine has a high-precision dial and is constructed of clinical-grade materials and components.


  • It's a clock-style blood pressure monitor with a Diamond dial. It has a large dial measuring 6 by 6 inches for easier reading.
  • It features a classic appearance and a durable finish. Rubber tubes that can be coiled and expanded Cuff, control valve, bladder, and bulb are all unique.
  • It is long-lasting. The dial is printed in a square form with a contrast colour backdrop. The dial's face plate may be adjusted to any comfortable reading position.
  • Multi-purpose usefulness that may be used as a desk top, a stand, or a wall mount.
  • It may be used on a desk or hung on the wall, depending on one's desire.

Aneroid Sphygmomanometer BP Apparatus from Dr. Odin

Zinc alloy is used to produce this high-precision gauge, making it more durable. It has been pressure tested to ensure optimum accuracy. With a 0-300 mmHg manometer, it boasts a clinical accuracy of +/- 3 mmHg. The rear of the gauge contains a metal clip to make testing easier.

  • INFLATION BULB WITH AIR RELEASE VALVE: The inflating bulb is comprised of latex and is both break and stick resistant. To prevent corrosion, the air release valve is chrome plated.
  • COTTON CUFF WITH EXTRA WIDE VELCRO FASTENERS: It includes a unique cotton cuff that keeps the patient comfortable and pain-free. It boasts extra-wide Velcro fastening for a secure fit and is adjustable to fit all arm sizes.
  • STETHOSCOPE INCLUDED:  The kit includes an acoustic stethoscope with a single head. It's small, light, and has a dual frequency.
  • CARRY CASE: The device comes with a leather casing that allows it to be transported without losing any of its components. It also safeguards the device from damage.

Palm Type Aneroid Sphygmomanometer (BP Monitor Dial Type)

Monitoring blood pressure with a physician or healthcare staff provides a great deal of comfort and guarantee of accuracy. The Premium Quality Palm Type Aneroid Sphygmomanometer was created with health care professionals and caregivers with basic medical training in mind.

 Key Features

  • Dial Gauge, Control Valve, and Inflating Bulb are all merged into one piece. Produced using high-quality, high-performance materials
  • Large scale 0-300mmHg for easier reading. For the convenience of the user, a hand-held application has been developed.
  • Additional cotton cuff with D-ring for added comfort. 
  • Elegant style, highly sturdy and stiff construction 
  • Easy for B.P. measurement sitting quite close to the patient 
  • Dial gauge may be adjusted to suit your left or right-hand control