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Oxygen Saturation in Lower Respiratory System (via Probe)

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

This test measures how well oxygen is being absorbed and transported in the lower parts of your lungs using a small sensor probe. It helps assess lung function and oxygen levels in specific areas of your respiratory system.

Quick summary

["This test helps doctors check if your lungs are working properly in certain regions."]

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

Key facts at a glance

LOINC
94375-3
Short code
K oxytoca DNA Lower resp Ql NAA+probe
Synonyms
K oxytoca DNA Lower resp Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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 probe detects oxygen saturation levels (often expressed as a percentage) in the lower respiratory tract. This is typically done during a diagnostic procedure like a bronchoscopy or during monitoring in specialized settings, such as intensive care units.

Why It’s Done

Your healthcare provider may order this test if they suspect issues like chronic obstructive pulmonary disease (COPD), lung infections, or other conditions affecting oxygen exchange in the lower lungs. It can also be used during procedures to ensure safe oxygen levels during interventions.

How the Test Works

A small sensor probe is inserted into the lower respiratory tract to continuously monitor oxygen saturation. The probe measures the amount of oxygen bound to hemoglobin in the blood in that specific area.

What to Expect

The procedure may involve a brief insertion of the probe, which could cause mild discomfort. You might feel some pressure or irritation, but it is generally quick and painless. Recovery is usually immediate, and you can resume normal activities afterward.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

What does a low or high oxygen saturation in the lower respiratory system indicate?
Low oxygen saturation in the lower lungs may suggest poor ventilation, infection, fluid buildup, or other lung conditions that restrict oxygen absorption. High levels might indicate over-oxygenation, which can occur in certain medical settings or during interventions.
How often should I get this test?
The frequency depends on your medical condition and treatment plan. Your healthcare provider will determine how often this test is needed based on your symptoms, diagnosis, and ongoing care.
Can this test be done at home?
This specific test is typically performed in clinical or hospital settings due to the need for specialized equipment and procedures. However, general oxygen saturation monitoring (like pulse oximetry) can sometimes be done at home for certain conditions.
  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