Skip to content

Oxygen Saturation (SaO₂) via Device Probe

Published: August 9, 2026Updated: August 16, 2026

This test measures the percentage of oxygen bound to hemoglobin in your blood, detected by a specialized device probe.

Quick summary

["Your blood’s oxygen levels are checked using a simple, non-invasive probe for quick monitoring."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
73803-9
Short code
SaO2% Device SaO2% sensor type
Synonyms
SaO2% Device SaO2% sensor type
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What This Test Measures

The device probe assesses how well your blood is carrying oxygen, typically used in clinical settings to monitor oxygenation status in real time. This is not a routine blood draw but a continuous or intermittent measurement often tied to devices like pulse oximeters or specialized monitoring equipment.

How It’s Performed

You’ll place a small sensor on your finger, toe, or ear lobe. The device will send a gentle light through your blood to detect oxygen saturation levels. This process is quick, painless, and doesn’t require a blood sample.

Why It’s Done

Doctors may order this test to check for conditions affecting oxygen levels, such as respiratory issues, heart problems, or during recovery from surgeries or illnesses. It helps track how well your body is getting enough oxygen.

What to Expect

You may feel a slight pressure or warmth from the probe, but there’s no discomfort. Results are displayed immediately on the device. If you have sensitive skin, let your healthcare provider know before use.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Low oxygen saturation (below 90%) can signal serious conditions like severe lung disease, heart failure, or anemia. High levels may indicate polycythemia (too many red blood cells). Continuous monitoring helps adjust treatments like oxygen therapy or manage chronic conditions effectively.

Frequently asked questions

Will this test show my blood oxygen levels like a typical blood test?
No, this test specifically measures oxygen saturation (SaO₂) using a probe, not a blood draw. It provides real-time readings but doesn’t analyze blood chemistry like a standard lab test.
How often can I use this device?
The frequency depends on your healthcare provider’s instructions. Some devices are used intermittently for monitoring, while others may be continuous for patients with chronic conditions. Always follow your doctor’s guidance.
Can I use this device at home?
Yes, many devices are designed for home use, but only if prescribed by your healthcare provider. Ensure it’s FDA-cleared and properly calibrated for accuracy.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy