A fingertip pulse oximeter is a small device that can provide a quick estimate of blood oxygen saturation and pulse rate. For people who use one at home, knowing how to take a reading correctly is important.
Small factors such as movement, cold hands, poor circulation or nail polish can affect a reading. Taking a few simple steps before and during measurement can help you obtain a more consistent result.
In this guide, we explain how to use a fingertip pulse oximeter correctly, what the numbers on the display mean, factors that can affect readings and when it is important to seek medical advice.
Important: A pulse oximeter provides an estimate and should not be used on its own to diagnose a medical condition. If you are concerned about a reading or have serious or worsening symptoms, contact an appropriate healthcare professional. The FDA also advises users to consider symptoms alongside pulse oximeter readings.
What Is a Fingertip Pulse Oximeter?
A pulse oximeter is a small device that is usually placed over a fingertip. It uses light to estimate the amount of oxygen in the blood and can also display pulse rate.
The Origin Medical Fingertip Pulse Oximeter is designed for adult users and features a colour OLED display, adjustable display orientation and an ergonomic, lightweight design. The device uses two AAA batteries and includes a low-battery indicator and automatic power-saving function.
It is designed for convenient spot checking at home or when travelling, while following the manufacturer's instructions for use.
How to Use a Fingertip Pulse Oximeter
Getting a useful reading starts with preparation. Follow the manufacturer's instructions for your specific device, then use the following general steps.
Step 1: Rest Before Measuring
Before taking a reading, sit down and allow yourself to settle.
Avoid taking a measurement immediately after exercise or significant physical activity if you are trying to obtain a resting reading. Movement and changes in circulation can affect measurements.
The FDA recommends that people using a pulse oximeter at home follow their healthcare provider's instructions about when and how frequently to check their oxygen levels.
If you are monitoring a health condition, follow the measurement schedule provided by your healthcare professional rather than creating your own schedule.
Step 2: Make Sure Your Hand Is Warm and Relaxed
Cold fingers can make it more difficult for a pulse oximeter to obtain a reliable signal.
Before measuring, make sure the hand you are using is comfortably warm and relaxed. Poor circulation and skin temperature are among the factors that can affect pulse oximeter readings.
Avoid squeezing or tensing your finger while the device is taking the measurement.
If your hands are cold, allow them to warm naturally before trying again.
Step 3: Check Your Fingernail
Nail polish and artificial nails can interfere with some pulse oximeter readings.
If possible, use a finger without nail polish or remove the polish from the finger being measured. The FDA lists fingernail polish among the factors that can affect pulse oximeter accuracy.
This is particularly useful if a reading appears inconsistent with previous measurements or with how you feel.
Step 4: Position the Finger Correctly
Open the pulse oximeter and gently place your finger inside according to the device instructions.
The sensor should sit securely on the fingertip without excessive pressure.
For the Origin Medical Fingertip Pulse Oximeter, the product is designed to provide measurements at the fingertip and features an ergonomic design intended for comfortable use.
Once the device is positioned, keep your hand relaxed and still.
Step 5: Keep Still During the Measurement
Movement can interfere with the sensor and make the displayed numbers fluctuate.
Once the pulse oximeter is attached, keep your finger and hand as still as possible. Avoid talking with your hands, walking around or repeatedly repositioning the device.
The FDA specifically recommends sitting still and avoiding movement of the body part where the pulse oximeter is positioned. Give the device time to detect your pulse and produce a stable reading.
Step 6: Wait for the Reading to Stabilise
One of the most common mistakes is looking at the display too quickly.
The numbers may change for a few seconds while the device detects the signal. Wait until the reading stops changing and displays a stable number before recording it.
The Origin Medical Fingertip Pulse Oximeter provides SpO₂ and pulse rate readings through its colour OLED display.
If the numbers continue changing significantly, remain still and allow the device more time.
Step 7: Understand What the Display Shows
Most fingertip pulse oximeters display at least two important measurements.
SpO₂
SpO₂ refers to peripheral oxygen saturation. It is displayed as a percentage and provides an estimate of the oxygen saturation of the blood.
The FDA notes that oxygen saturation values are between 95% and 100% for most healthy individuals, although readings can be lower in people with certain lung or heart conditions and at higher altitudes.
A single number should not automatically be interpreted as a diagnosis.
Pulse Rate
The device can also show your pulse rate, generally expressed as beats per minute.
This gives you information about how fast your heart is beating at the time of the measurement.
The Origin Medical device is designed to provide both oxygen saturation and heart pulse rate readings.
Step 8: Record Your Reading When Appropriate
If you are monitoring your oxygen levels because your healthcare professional has recommended it, keeping a record can be useful.
Record:
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Date
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Time
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SpO₂ reading
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Pulse rate
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Any relevant symptoms
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Any circumstances that may have affected the reading
Tracking measurements over time can provide more useful information than focusing on one isolated number.
The FDA recommends recording oxygen levels along with the date and time when monitoring at home so changes can be tracked and discussed with a healthcare provider when appropriate.
When Should You Repeat a Reading?
There may be situations where repeating a reading is useful.
For example, you may want to take another measurement if:
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The device was not positioned correctly
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You were moving during the first reading
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Your hands were cold
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The displayed number had not stabilised
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The reading seems inconsistent with previous readings
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The device was removed or repositioned during measurement
Before repeating the reading, correct the potential problem rather than immediately taking multiple measurements without changing anything.
If you have been given specific instructions by your doctor or healthcare professional, follow those instructions.
Factors That Can Affect Pulse Oximeter Readings
Pulse oximeters are useful tools, but readings are not infallible.
Several factors can affect the measurement, including:
Movement
Moving your finger or hand during measurement can interfere with the signal.
Cold Hands
Low skin temperature can affect circulation at the fingertip and may influence the reading.
Poor Circulation
Reduced blood flow can make it harder for the sensor to obtain a strong signal.
Nail Polish
Certain nail polish or artificial nails may interfere with the measurement.
Skin Pigmentation
The FDA has highlighted ongoing concerns about differences in pulse oximeter performance across different skin pigmentation levels, particularly when oxygen levels are low.
Tobacco Use
Current tobacco use is another factor identified by the FDA as potentially affecting pulse oximeter accuracy.
Other Technical Factors
Device positioning, ambient conditions and the quality of the detected pulse signal can also affect results.
For this reason, pulse oximeter readings should always be interpreted in context rather than treated as an exact measurement of your overall health.
Why Symptoms Matter Alongside the Reading
One of the most important things to remember when using a pulse oximeter is that the number on the screen is only one piece of information.
A person can have concerning symptoms even if the displayed reading does not immediately appear abnormal.
The FDA advises people monitoring oxygen levels at home to pay attention to how they feel and to contact a healthcare provider if they are concerned about a reading or if symptoms are serious or getting worse.
Symptoms that may require urgent medical attention include severe difficulty breathing, chest pain or tightness, blue or grey colouring of the lips or face, significant worsening of breathing, or loss of consciousness. Healthdirect advises calling Triple Zero (000) for severe difficulty breathing, particularly when accompanied by signs such as drowsiness, sweating, pale or blue colouring.
Do not rely solely on a pulse oximeter to decide whether medical care is necessary.
When to Seek Medical Advice
If you are concerned about your oxygen saturation reading, particularly if the reading remains unusual after you have repeated the measurement correctly, contact a healthcare professional.
You should also seek medical advice if you experience symptoms such as:
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Shortness of breath
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Difficulty breathing
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Worsening cough
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Chest pain or tightness
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Blue or grey colouring around the lips or face
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A fast or racing pulse
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Significant deterioration in how you feel
If symptoms are severe or rapidly worsening, seek urgent medical assistance. In Australia, call Triple Zero (000) for an emergency.
Your healthcare professional can interpret your readings alongside your symptoms, medical history and other relevant information.
How the Origin Medical Fingertip Pulse Oximeter Can Fit Into Your Home Health Routine
The Origin Medical Fingertip Pulse Oximeter is designed to make spot checking convenient.
According to the current product listing, it features:
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Lightweight ergonomic design
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Colour OLED display
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Adjustable display orientation
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Adjustable parameters
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Low-battery indicator
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Automatic power-saving function
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Two AAA batteries
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Adult-only use
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Portable design
The device is currently listed as in stock on Origin Medical's website.
For people who have been advised to monitor their oxygen saturation and pulse rate at home, a compact fingertip device can make these measurements easy to incorporate into a regular routine.
Explore Origin Medical Respiratory Health Devices
Origin Medical's Health Goals page includes a dedicated Respiratory Health section focused on monitoring blood oxygen saturation and pulse rate at home. The current page features the Origin Medical Fingertip Pulse Oximeter within this category.
You can also explore the wider range of Origin Medical home health devices, including blood pressure monitors, thermometers, bathroom scales and oral healthcare products.
Explore Origin Medical Health Goals
Final Thoughts
Using a fingertip pulse oximeter correctly is relatively simple, but the way you take a measurement can influence the result.
For a more consistent reading, start by resting, make sure your hand is warm and relaxed, remove nail polish when possible, position the finger correctly and keep still while the device measures. Most importantly, wait for the numbers to stabilise before recording the result.
Remember that a pulse oximeter provides an estimate of oxygen saturation and pulse rate. It should be used alongside information about your symptoms and, when appropriate, guidance from your healthcare professional.
If you have been advised to monitor your oxygen levels at home, following a consistent measurement routine can make the information you collect more useful when discussing your health with a healthcare professional.
