Oxygen Saturation During Inspiration (Fraction of Inspired Oxygen)
This test measures how effectively your lungs transfer oxygen into your blood while you breathe in. It helps assess lung function and oxygen exchange efficiency.
["A test to check how well your lungs deliver oxygen during inhalation, useful for diagnosing breathing or lung-related conditions."]
Key facts at a glance
- LOINC
- 62274-6
- Short code
- O2 during insp VFr/PPres Away adap
- Synonyms
- O2 during insp VFr/PPres Away adap
- 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
This test evaluates the oxygen saturation in your blood when you inhale air containing a known concentration of oxygen. It reflects how efficiently your lungs absorb oxygen from the air you breathe. The measurement is often taken using a specialized breath test or pulse oximetry during inhalation phases.
Why It’s Done
Your healthcare provider may order this test if you have symptoms like shortness of breath, chronic lung conditions (such as COPD or asthma), or if you’re at risk for lung-related issues. It can also help monitor oxygen levels in patients with respiratory disorders or those undergoing treatments affecting lung function.
How It’s Performed
The procedure typically involves wearing a mask or nose clip that delivers a controlled oxygen mixture while you breathe in. A sensor attached to your finger (or other body part) measures oxygen saturation levels in real time. The test may take a few minutes and is usually painless.
What to Expect Before or After
No special preparation is needed, but inform your provider about recent illnesses, medications, or smoking history. After the test, you may resume normal activities immediately, though you might feel slightly dizzy if you were exposed to high oxygen concentrations.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal results may indicate impaired lung function, such as ventilation-perfusion mismatches (e.g., in emphysema or pulmonary edema), or conditions affecting oxygen transport (e.g., anemia or blood disorders). Low saturation during inspiration can signal poor lung capacity or respiratory distress, prompting further evaluation for underlying causes.
Short name
O₂ Saturation (Inspiratory)
Frequently asked questions
How often can this test be repeated?
Does this test require fasting?
What does a normal result mean?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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