Pulse Oximeter: Uses, Benefits & More

pulse oximeter-Wrist-oximeter

People suffering from conditions such as asthma, COPD, and Congestive heart failure among other similar maladies.

In that case, need oxygen levels in their blood is measured in order to regulate a treatment.

A pulse oximeter is a painless and non-invasive device that allows monitoring the amount of oxygen carried in the body.

This device is small enough to be used at home as well.

It allows monitoring of the smallest changes in oxygen saturation levels.

It is efficient in detecting the supply to the furthest extremities. More importantly, from the heart such as legs and arms.

What is a Pulse Oximeter?

A pulse oximeter is a small clip like device that can be attached to any part of the body. It is generally used in critical care settings like emergency rooms and Intensive Care Units.

Doctors like pulmonologists might use it in their offices as well. You can also find them in ambulances, operating rooms and recovery and critical care.

However, smaller units designed specifically for home care are available in the market to help patients.

Especially, with conditions like asthma and COPD to monitor their oxygen levels. 


There are a lot of benefits to this simplistic design that allows monitoring of oxygen levels in the hemoglobin being carried by the blood.

The prime benefit of this device is that it is simplistic and not very expensive. The method of using it is easy and uncomplicated.

Also, it provides immediate results that allow for changes in treatment to take place in real time.

Other benefits of this device are focused on the user experience. 

Non-invasive and Painless

It is non-invasive and painless that allows it to be used multiple times without any discomfort.

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Zacurate Pro Series 500DL Fingertip Pulse Oximeter Blood Oxygen Saturation Monitor with Silicon...
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It is also extremely compact that allows it to be stored in minimal spaces. However, the most glaring benefit is in the detection of hypoxemia.

Traditionally, this condition is diagnosed by the occurrence of cyanosis. Use of oximeters proves to be an easier and more detailed method to detect this condition.

How It Works

This device does not directly measure the oxygen saturation levels in your body because it is non-invasive.

However, it uses data and complex equations to provide an accurate reading. That said, the readings can be off by a maximum of 2%.

One side of the clip-on probe shines light through a relatively transparent part of the body. The other side of the probe has a detector that measures the amount of light received.

The data is then processed through the machine to come to an accurate reading.

What Does it Do?

The basic purpose of a pulse oximeter is to monitor and check oxygen pumped by your heart throughout the body.

However, the applications of the results can vary from patient to patient.

It is important to understand what oxygen saturation is before discerning the benefits of this device.

Oxygen Saturation

Our blood contains tiny hemoglobin cells that are responsible for moving oxygen throughout the body.

Hemoglobin without oxygen is called de-oxygenated hemoglobin.

Oxygen saturation refers to the percentage of oxygenated hemoglobin present in the blood.

An oxygen saturation level of 95% is considered normal and healthy. 89% oxygenated hemoglobin is required in the body to keep the tissues healthy.

Levels below 92% generally indicate hypoxemia or deficiency of oxygen in tissues. 


The usual functions that this device serves are:

Medication Assessment

Breathing Issues



Oxygen Therapy


Sleep Study

Conditions used in:

There are a number of conditions that require monitoring from this device.

It has been proven beneficial to people with cardiovascular conditions, individuals with infections and extremely young infants.

The usual conditions in which this device is used are:


Lung Cancer

Heart Attack



How to Use it?

The pulse oximeter has a clamp-like device that is attached to a thin skin area of the body such as toes, fingertips, and earlobes.

In infants, it would be clipped on to the foot. It uses small beams of light to measure the oxygen in the blood. 

Ways to Use it

Someone can use pulse oximetry in both medical facilities and at home. In fact, most times doctors recommend patients to get one for home use in order to maintain regular monitoring. 

Here are the various approaches to using it. 


They clip the probe or clip like an extension on the fingertips.

It is important to ensure that the probe is neither too loose nor too tight.

A loose probe might fall off during the analysis while a tight probe will constrict the circulation.

There should be a minimal pressure on the fingertip and absolutely no pain.

The device is kept clipped to the fingertip until saturation and pulse readings are acquired. While using fingers, it is important to keep the hand at heart level. 


Oxygen saturation levels can be obtained by clipping the probe to the earlobe.

However, it shall need to be attached to an ear hook or else it might fall off.

The device needs to remain attached until they acquire the readings.

Foot and Palms

Generally, with infants, neonates or small children who do not have big enough fingers or ears, the device is clipped to their palms or foot.

If using on a child, make sure that the child is in an inclined position.


They use this approach in extremely rare cases when digits or earlobes are not accessible. The reflectance probe is attached right above the eyebrows.

It is important to keep it away from any major vessels.

The patient should be in an inclined position, and they should use a headband to ensure that the probe does not fall off.

Limitations and Care

There are many circumstances in which a pulse oximeter might provide inaccurate results. It is important that care is taken especially while monitoring oxygen saturation levels at home.

Nail Polish

Bright Light


Other limitations


Pulse oximeter devices are a quick and non-invasive way to determine oxygen saturation levels in the blood.

They are extremely beneficial when used properly. If you are using a home device. Subsequently, it is important that you maintain a log of all your readings to help your physician determine your condition.

There are no side effects to using this device. However, some patients might suffer from mild skin rashes or irritation because of the adhesive used in probes.

Emergency care is advised if the results fall below normal levels of oxygen saturation.


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