Respiratory care
Pulse Oximetry Equipment & Support
Learn about fingertip pulse oximeters, blood oxygen saturation readings, pulse-rate monitoring, device features, measurement limitations, and product support available from MedPro.
✓ Portable oxygen-monitoring devices
✓ Product selection and usage support
Pulse Oximetry at a Glance
What to know
Oxygen Saturation
Displays an estimate of how much oxygen the blood is carrying, shown as an SpO₂ percentage.
Pulse Rate
Displays the estimated number of heartbeats or pulse beats per minute.
Readings Have Limitations
Movement, circulation, temperature, device fit, nail products, and other factors can affect the result.
Understanding pulse oximetry
What Is a Pulse Oximeter?
A pulse oximeter is a small, non-invasive device that uses light to estimate blood oxygen saturation and pulse rate without drawing blood.
Most home devices clip onto a fingertip. The sensor passes light through the finger and uses the detected light pattern to estimate the percentage of oxygen carried in the blood and the pulse rate.
Pulse oximetry provides an estimate rather than a diagnosis or laboratory measurement. Readings should be interpreted together with symptoms, changes over time, and the monitoring plan provided by the healthcare team.
Important to Know
✓ Follow the instructions provided with the exact device.
✓ Follow the monitoring plan provided by the healthcare team.
✓ Consider symptoms and readings together.
✓ Do not change prescribed oxygen based only on one reading.
✓ Ask your healthcare provider which changes are important for you.
Understanding the display
What Do the Numbers and Symbols Mean?
The exact display depends on the device. Most models show oxygen saturation and pulse rate, while some include additional signal information.
SpO₂
The device’s estimated blood oxygen saturation, generally displayed as a percentage.
Pulse Rate
The estimated pulse or heart rate, generally displayed as beats per minute.
Signal Indicator
A bar, waveform, or flashing symbol may show whether the device is detecting a pulse signal.
Perfusion Index
Some models show a perfusion index or similar measurement related to pulse-signal strength.
There is no single oxygen-saturation target or action threshold that applies to every person. Ask the healthcare provider to define the expected range and action plan.
Monitoring purposes
Different Ways Pulse Oximetry May Be Used
The monitoring purpose, frequency, device, and action plan should reflect the individual’s healthcare needs.
Fingertip Spot Checks
A portable fingertip device may be used for occasional readings at home, in a clinic, or while travelling.
Clinician-Directed Monitoring
A provider may ask a patient to track readings, symptoms, activities, dates, and times as part of a monitoring plan.
Overnight or Continuous Monitoring
Overnight and continuous monitoring use specialized equipment and should be arranged through an appropriate healthcare provider.
A consumer fingertip device is not a replacement for a prescribed overnight oximetry assessment, sleep study, or clinical respiratory assessment.
Device options
Choosing a Pulse Oximeter
Consider the intended use, sensor fit, display, signal information, portability, alarms, battery system, warranty, and manufacturer instructions.
Fingertip Pulse Oximeters
Compact devices that clip onto a finger and display a spot-check oxygen saturation and pulse-rate estimate.
- SpO₂ and pulse-rate display
- Pulse bar or waveform
- Automatic shutoff
- Rotating screen options
- Portable carrying case
Display & Signal Features
Screen and signal features may make the device easier to read and help users recognize when a stable signal is being detected.
- OLED or LED display
- Adjustable orientation
- Plethysmographic waveform
- Signal-strength information
- Low-battery indicator
Alarm-Enabled Devices
Some models include programmable high or low alarms and other notifications.
Alarm settings should reflect the patient’s clinical monitoring plan rather than a universal website recommendation.
Fit & Intended User
The sensor must fit the intended user properly and the screen should be easy for the user or caregiver to operate and read.
- Finger dimensions
- Adult or pediatric compatibility
- Hand dexterity
- Display readability
- Home or professional use
Using your device
Tips for a More Consistent Spot Check
Follow the device instructions and try to take comparison readings under similar conditions.
Prepare Your Hand
Use a warm, relaxed hand. Remove nail polish or artificial nails when required by the device instructions.
Remain Still
Sit calmly and keep the hand and finger still. Movement can interfere with the sensor and the displayed result.
Position the Device
Insert the finger fully into the sensor and make sure the device fits and faces the direction specified by the manufacturer.
Wait for Stability
Allow the numbers and signal indicator to settle before recording the date, time, symptoms, activity, and reading.
Device limitations
A Pulse Oximeter Reading Is an Estimate
Pulse oximeters can be useful monitoring tools, but no reading should be assumed to be perfectly exact. Accuracy varies by device and can decrease under certain conditions.
Some evidence indicates that pulse oximeters may overestimate oxygen saturation in people with darker skin pigmentation. Symptoms, trends, signal quality, and the individual’s overall condition should always be considered alongside the displayed number.
Do not rely on one pulse oximeter reading as the only measure of how well someone is breathing or how much oxygen they are receiving.
Factors That Can Affect a Reading
- Excessive movement
- Cold hands
- Poor circulation
- Improper placement
- Incorrect sensor fit
- Nail products
- Bright light
- Moisture
- Low blood pressure
- Severe anemia
- Skin pigmentation
- Weak pulse signal
Looking beyond one number
Consider the Reading, the Trend, and How You Feel
A repeated pattern and the person’s symptoms may provide more useful context than one isolated result.
Follow Your Personal Baseline
People with heart or lung conditions may have different usual readings. Ask the provider to define the expected range and action plan.
Watch for Changes Over Time
A repeated downward trend may provide more information than one result, particularly when readings are taken under similar conditions.
Pay Attention to Symptoms
Worsening breathing difficulty, chest discomfort, unusual drowsiness, confusion, or colour changes require attention regardless of the display.
For severe breathing difficulty, chest pain, confusion, a blue, white, or grey appearance around the lips or face, or rapidly worsening symptoms, call 911 or follow the patient’s emergency plan.
What to expect
Getting Started With Pulse Oximetry
Start by understanding why readings are being taken and how the results should be recorded and reported.
01
Confirm the Monitoring Purpose
Ask why readings are being taken, when they should be measured, and which changes should be reported.
02
Select an Appropriate Device
Choose a device that fits the intended user, monitoring purpose, display needs, and required features.
03
Establish a Recording Plan
Record readings consistently with the time, activity, oxygen setting where applicable, signal quality, and symptoms.
Do not change prescribed oxygen flow, respiratory medication, ventilation settings, or another treatment based solely on an unsupervised pulse oximeter reading.
Quick access
Pulse Oximetry Resources
Quickly access available devices, measurement guidance, oxygen information, and MedPro support.
Care & maintenance
Keep Your Pulse Oximeter Ready for Use
Clean, store, and maintain the device according to the manufacturer’s instructions. Avoid allowing liquid to enter the sensor, display, controls, or battery compartment.
Inspect the sensor before use and replace batteries when the device indicates that power is low or when performance becomes unreliable.
Do not use a damaged device or a sensor that no longer closes, aligns, or displays a stable signal properly.
General Care Checklist
✓ Inspect the sensor before use.
✓ Keep the optical surfaces clean.
✓ Use approved cleaning products.
✓ Do not immerse the device.
✓ Allow it to dry before reuse.
✓ Replace weak batteries.
✓ Store the device in its case.
✓ Avoid extreme heat, cold, and moisture.
Product selection
Features to Consider Before Ordering
Choose features that support the intended user and monitoring purpose without replacing clinical assessment or guidance.
Readability & Ease of Use
- Display size
- Screen brightness
- Screen rotation
- Button layout
- Automatic shutoff
- Carrying case
Monitoring Features
- SpO₂ and pulse display
- Signal or pulse bar
- Plethysmographic waveform
- Perfusion index
- Programmable alarms
- Memory or data storage
Product & Support Information
- Intended medical use
- Canadian licensing information
- Manufacturer instructions
- Product warranty
- Service and replacement support
- Sensor-size suitability
Ordering information
Before You Order a Pulse Oximeter
Consider how the device will be used, which features are required, and whether supporting documentation may be needed.
Intended Use
Clarify whether the device is needed for occasional checks, a provider-directed plan, professional use, or another purpose.
Product Availability
Models, features, and inventory may vary by clinic and online availability. Confirm stock before visiting for a specific model.
Insurance & Funding
Coverage may depend on the province, benefits plan, medical necessity, product classification, documentation, and eligibility.
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Frequently asked questions
Common Questions About Pulse Oximeters
General answers about measurements, device use, accuracy, care, and product availability.
What does a pulse oximeter measure?
A pulse oximeter estimates blood oxygen saturation and pulse rate using light. It does not directly measure oxygen through a blood sample.
What does SpO₂ mean?
SpO₂ is the pulse oximeter’s estimate of the percentage of oxygen-carrying haemoglobin in the blood.
Is pulse rate the same as heart rate?
They are often similar, but the device estimates a pulse detected at the sensor site. Irregular rhythms, movement, and weak circulation may affect the result.
What is considered a normal oxygen saturation reading?
Usual readings and action thresholds vary according to health conditions, elevation, prescribed oxygen, and the individual care plan. Ask a healthcare provider to define the appropriate range for you.
Why is my reading changing?
Readings can change with breathing, activity, movement, circulation, hand temperature, sensor placement, signal quality, device accuracy, and health status.
How long should I wait for the reading to stabilize?
Follow the manufacturer’s instructions. In general, keep still and wait until the numbers and signal indicator appear stable before recording the result.
Which finger should I use?
Use a finger that fits the sensor properly and follow the instructions for the exact model. Try to use the same finger when comparing trends.
Can cold hands affect the reading?
Yes. Cold hands can reduce circulation at the finger and weaken the pulse signal. Warm and relax the hand before trying again.
Can nail polish or artificial nails affect accuracy?
They can interfere with light transmission for some devices. Remove them from the measurement finger when required by the product instructions.
Does skin pigmentation affect pulse oximeter accuracy?
Research and safety guidance indicate that some devices may overestimate oxygen saturation in people with darker skin pigmentation. Consider symptoms and trends alongside the reading.
Can movement affect the reading?
Yes. Movement can interfere with pulse detection and create an unstable or inaccurate result. Keep the hand and finger still.
Can I use a pulse oximeter while receiving oxygen?
A provider may include pulse oximetry in an oxygen-monitoring plan. Record the prescribed oxygen setting with the reading when instructed.
Should I change my oxygen flow when a reading is low?
Do not change prescribed oxygen flow based only on an unsupervised reading. Follow the written oxygen and action plan provided by the healthcare team.
Can a pulse oximeter diagnose a medical condition?
No. A consumer pulse oximeter provides an estimate and does not replace medical assessment, laboratory testing, diagnosis, or a prescribed respiratory study.
What is a perfusion index?
Perfusion index is a device-specific measurement related to the detected pulse signal at the sensor site. Follow the manufacturer’s instructions for interpretation.
Can children use a fingertip pulse oximeter?
Only use a device whose sensor and intended-use information are appropriate for the child’s finger size and monitoring needs. Adult sensors may not fit properly.
How should the device be cleaned?
Use the cleaning method and products specified by the manufacturer. Do not immerse the device or allow liquid to enter the electronics.
Does MedPro carry pulse oximeters?
Yes. Available models can be viewed in MedPro’s online Pulse Oximeters category. Product assortment and inventory may change.
Does every MedPro clinic carry the same model?
Product availability may vary by location and current inventory. Contact your preferred clinic before visiting for a specific model.
Important: This page provides general product and monitoring information and does not replace medical assessment, diagnosis, manufacturer instructions, or an individualized care plan. Pulse oximeter readings are estimates and may be affected by device fit, movement, circulation, temperature, nail products, skin pigmentation, and other factors. Consider symptoms and readings together. Do not change prescribed oxygen or treatment based only on a pulse oximeter reading. For severe breathing difficulty, chest pain, confusion, or rapidly worsening symptoms, call 911.
Personal support
Need Help Choosing a Pulse Oximeter?
Connect with MedPro for help reviewing available pulse oximeters, display features, signal indicators, alarm options, portability, and product availability.