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Respiratory Prebronchoscopy Gas Analysis (Partial Pressure of Gases in Arterial Blood)

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

This test measures the levels of oxygen and carbon dioxide in your blood before a bronchoscopy procedure. It helps assess how well your lungs are working and ensures your oxygen levels are safe for the exam.

Quick summary

["This test helps prepare your care team by checking your breathing and blood oxygen levels before a bronchoscopy."]

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

Key facts at a glance

LOINC
9299-9
Short code
Resp rate pre bronchoscopy
Synonyms
Resp rate pre bronchoscopy
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 Does This Test Measure?

Your blood sample will be taken from a vein in your arm and analyzed for two key gases: oxygen (O₂) and carbon dioxide (CO₂). These measurements help determine how efficiently your lungs are delivering oxygen to your body and removing waste gases like CO₂.

Why Is This Test Done Before Bronchoscopy?

A bronchoscopy is a procedure to examine your airways. This test ensures your oxygen levels are stable and your body is well-prepared for the procedure, reducing the risk of complications during or after the exam.

What Are the Possible Results?

Results will show your arterial blood oxygen pressure (PaO₂) and carbon dioxide pressure (PaCO₂). These values help doctors assess your respiratory health and guide their decisions during the bronchoscopy.

What Does This Test Tell Your Doctor?

Your results will help your healthcare provider determine if your lungs are functioning properly, whether you have any breathing issues, and if you need additional support (like oxygen therapy) before or after the bronchoscopy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for ensuring patient safety during bronchoscopy by verifying adequate oxygenation and carbon dioxide clearance, which can influence anesthesia decisions and airway management.

Short name

Arterial Blood Gas (ABG) Pre-Bronchoscopy

Frequently asked questions

How is this test performed?
A healthcare professional will insert a small needle into a vein in your arm to draw a small amount of blood. The sample is then sent to a lab to measure the gas levels in your blood.
Is there any preparation needed?
No special preparation is required, but you may be asked to fast for a short period if you are having other blood tests on the same day. Let your doctor know if you are on any medications.
Will I feel any pain or discomfort?
You may feel a slight pinch when the needle is inserted, but the procedure is quick and usually not painful. You can usually resume normal activities immediately after.
  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