How to Use a Finger Pulse Oximeter to Get Accurate Results
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Working Principle of Oximeter

Working Principle of Oximeter | How to Use a Finger Pulse Oximeter to Get Accurate Results | Scoop.it
Pulse oximeters are medical devices commonly used throughout the healthcare industry to measure percent oxygen saturation and pulse rate
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If you are looking for a way to measure the level of oxygen using an invasive method then pulse oximeter would be the right choice. The device can measure the level of oxygen accurately and it is a simple procedure. Just fix the probe of the device to the finger and measure the oxygen level in blood and heart beat accurately. The device also shows a graphical display that acts as an indicator to know the oxygen level. In case if there is a vasoconstriction then the device would not be able to give the right output graph.

Lights of 2 types with different wavelength originate from the wrist pulse oximeter. The two different wavelengths are 650nm and 805nm. Light absorption by hemoglobin varies between saturated and de-saturated oxygen.


The processor of the portable pulse oximeter calculates the ratio of oxygenated blood to deoxygenated blood and it gives the percentage of oxygen present in the blood. If there is any vasoconstriction or if the flow of blood is restricted then the device cannot give accurate signals.


Normally the probe has to be fixed to the ear lobe or finger of the person.

There are few precautions that needs to be followed before using the device
(1)First thing you need to make sure is that the person has stable peripheral vascular function.
(2)Clean the probe completely, if possible using a disinfectant solution.
(3)Nail polish has to be removed from the finger completely otherwise the signals cannot get transmitted through it accurately.
(4)If you feel there is an error in reading then change the probe and use a new one.
(5)Make sure the circulation of blood is adequate by checking the site of probe.
(6)Try to replace the probe at least once in 6 months or 1 year.
(7)If it is for infants or elderly patients, closely monitor them and make sure that the device gives accurate readings.


Limitations of pulse oximeter
The oximeter device also has its own limitations and there are few error sources that can occur in the device. In patients suffering from hypotension there is a possibility for loss of signal and the underlying cause has to be fixed to get accurate readings. Fluids must be administered to overcome this problem.

Intense bright light must be avoided while using pulse oximeter. Fluorescent bright light can interfere with the sensor and lead to inaccurate readings.

If there is any body movement of the person then it can causes changes in the reading. Shivering and muscle twitching can affect the output reading. In order to get accurate readings wait until shivering stops.

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Best Way to Use an Oximeter to Get Accurate Readings

Best Way to Use an Oximeter to Get Accurate Readings | How to Use a Finger Pulse Oximeter to Get Accurate Results | Scoop.it

Pulse Oximeter is a device that is used to measure the level of oxygen and heart pulse rate accurately. It is a non-invasive method and helps to measure the level of oxygen in blood accurately. The device is most commonly used in hospitals, ambulance, emergency rooms and in some cases it is used in home for personal use. When using the device there are few chances for false readings to occur. In this article you will find how to avoid false readings and take accurate readings in the device.

 

Keep electronic devices away
Do not keep any electronic or electric devices near to pulse oximeter as it can interfere with the readings and result in false values. Also mobile phones and other way emitting devices must be kept away.


Skin Condition
Waxy or oily substances in the skin can result in false readings so make sure to clean the surface of the skin before placing the probe. If you have applied any lotion or make ups, wash it completely using a mild soap and then fix the probe.

 

Avoid measuring in places with carbon monoxide
Carbon monoxide has the power to bind with oxygen more than 250 times the oxygen. Moreover it can also turn the hemoglobin to red bright color. The sensor in the pulse oximeter finds difficult to differentiate the oxygen and carbon monoxide.
 

Also it is hard to get accurate reading from a smoker, if you are going to measure oxygen level from a smoker and they should refrain from smoking for at least 5 hrs. When you use a fingertip pulse oximeter to measure oxygen level, use it in a room free from carbon monoxide.
 

Avoid bright Light
Pulse oximeter measures the level of oxygen in blood using sensors, the result is given by the amount of light transmitted in blood, in case if any bright light either artificial or natural can alter the values of the output.


Must be stable
When measuring the level of oxygen the patient should never move, they should either sit or lay down in the bed. Moving or shaking the probe can change the output readings.


Weak patient
In case if the patient is weak, then there chance to get accurate readings even from the best pulse oximeter is very low. Moreover it is impossible to obtain correct readings in patients with cardiac arrhythmias.


Fix the probe at right place
The probe of the pulse oximeter has to be fixed in places where the blood flow is high. It can be fixed to the ear lobe or finger to take accurate readings.
 

Change probe once in a year
With regular use the probe can get easily damaged, it is good to change the probe at least once in a year to get accurate readings. If you feel the reading is false you can try to measure by changing the probes.

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How to Measure Oxygen Level in Blood

How to Measure Oxygen Level in Blood | How to Use a Finger Pulse Oximeter to Get Accurate Results | Scoop.it

Oxygen is one of the important components of blood and it helps for the normal function of the human body. A normal body takes more than 13 pints of air per minute into the body to supply oxygen for the whole body and 13 pints of air per minute equals to 7387.38 cubic centimeters (CC) per minute. Adequate amount of oxygen in blood is essential for the regular function of the body. In case if the oxygen level falls beyond the normal level then the vital organs of the body starts to fail.
 

Concentration level of alcohol gets lowered in chain smokers and regular alcohol consumers. The normal oxygen level is 95% to 100% and if it falls beyond this level then oxygen mask must be provided immediately to the patient. If immediate measure is not taken then it can lead to life threatening condition.


How oxygen works in the human blood?

As we breathe oxygen passes through the lungs, then the oxygen which is a component of blood gets separated and to deposit in the hemoglobin. As we know, hemoglobin is the important component of blood. Hemoglobin acts as a carrier for oxygen, when the blood binds with the oxygen its color gets changed from bluish purple to red. Blood which is dark red in color means it is rich in oxygen.


The concentration or amount of oxygen present in blood is usually called oxygen saturation or 'sats'. If the saturation process does not take place properly then it leads to low level of oxygen in blood. During the saturation process the blood looks like an aerated drink. A hemoglobin molecule has the capacity to hold more than 4 molecules of oxygen at the same time.


The factor that decides the blood oxygen level is the amount of exchange of oxygen between the alveolar-capillary interfaces within the lungs. Another factor is the pressure of intake oxygen and the quality of hemoglobin present.


Measuring blood oxygen using Pulse Oximeter

The pulse oximeter device comes calibrated to measure the normal level of oxygen in blood. The pulse oximeter device has to be fixed to the finger or ear lobe of the patient. In a normal adult the oxygen level fluctuates between 95% to 100% while in children it is about 97% to 98% and then gradually rises to 100%


Pulse Ox device is commonly used in persons suffering from sleep apnea and Asphyxia. If the level of oxygen goes beyond a normal level then discoloration of skin takes place and it turns into blue color so adequate amount of oxygen has to be maintained at all times.

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How to Use a Finger Pulse Oximeter to Get Accurate Results - PulseOxiMetersPlus.com

How to Use a Finger Pulse Oximeter to Get Accurate Results - PulseOxiMetersPlus.com | How to Use a Finger Pulse Oximeter to Get Accurate Results | Scoop.it

There are different types of devices available in the market to measure the level of oxygen in blood and one such device is the pulse oximeter that provides accurate results. As we all know, oxygen plays a main role in the life of every human being and depletion of oxygen level in the body can cause unwanted side effects and at times can lead to life threatening conditions. An oximeter can easily help to detect any change in oxygen level of the blood before the body starts to show any symptoms. The device makes use of infrared rays that is used to measure the percentage of oxygen present in red blood cells.
 

Fingertip oximeter is a compact handheld device that can be used at home and for personal use. It is a must for old aged people and for persons suffering from heart and lung related problems. To analyse O2 saturation levels, it does not require any invasive procedure rather the level can be accurately measured by clipping the device to anyone of the fingers. Almost anyone can use this device and it avoids the need for travelling to hospitals every time to check oxygen level in blood.


In order to get accurate results one has to use the pulse finger oximeter in the right way and here we will discuss how the device can be used in a proper way.


Index finger is usually used to measure the readings, before clipping the device nail varnish or polish has to be removed completely. Also make sure to remove rings and other ornaments from fingers as it can cause inaccurate readings. When you fix the clip, if you feel any pain then it shows that the probe of the fingertip pulse oximeter is not fitted in the right way, remove and fit it again. Once you fix the glitch, turn it on and set it to the right configuration.


Next important thing is to check the signal strength and make sure it works perfectly. If the signal is weak then it shows the circulation of blood is very low or the person is suffering with anaemia. Do not shake or move your finger as it can cause change in readings, so make sure to keep the hand in stationary position. The level of oxygen present in blood is displayed on the screen in percentage value and normally the heart symbol represents the pulse rate of heart and the notation shows the amount of oxygen in blood. In a normal person the oxygen level must be in the range of 95% to 99%.


Functions and specifications vary from brand to brand, so it is always good to go through the manual before you start using it. Also make sure to clean the probe of portable pulse oximeter every time after use.

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