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Oxygenated hemoglobin concentration in whole blood

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

This test measures the amount of oxygen bound to hemoglobin in your red blood cells, helping assess how well oxygen is being transported throughout your body.

Quick summary

["Helps evaluate oxygen delivery and potential blood oxygenation issues."]

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

Key facts at a glance

LOINC
19971-1
Short code
OxyHgb pre Tx % BldA
Synonyms
OxyHgb pre Tx % BldA
Category
hematology
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
12
Ref high
17.5
Critical range
7 N/A – 20 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85018
SNOMED
900000000000003004
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Does This Test Measure?

Oxyhemoglobin (HbO₂) is the form of hemoglobin that carries oxygen from your lungs to tissues across your body. This test quantifies the concentration of oxygenated hemoglobin in your red blood cells, which can be useful in diagnosing or monitoring conditions affecting oxygen transport, such as anemia or respiratory disorders.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like shortness of breath, fatigue, or if you’re being evaluated for conditions like chronic obstructive pulmonary disease (COPD), anemia, or other blood-related disorders.

Common Conditions Monitored

While not routinely ordered for general health screening, this test can be part of a broader evaluation for conditions affecting oxygenation, such as severe anemia, blood disorders, or respiratory emergencies.

How Is the Sample Collected?

A small blood sample is drawn from a vein, typically in your arm. The test measures oxygen saturation indirectly by analyzing the blood’s ability to carry oxygen, though direct measurement of HbO₂ is less common in routine labs.

Reference range

Adult males: 13.5-17.5 g/dL; Females: 12.0-16.0 g/dLN/A

Specimen: whole-blood

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Oxyhemoglobin (HbO₂) Level

Frequently asked questions

How Often Is This Test Performed?
This test is not a standard routine check and is usually performed only when clinically indicated, such as during specialized evaluations or emergencies. Frequency depends on your medical condition and provider’s recommendations.
What Are the Normal Values?
Exact reference ranges vary by lab and clinical context. Values are interpreted in relation to your overall health and symptoms rather than absolute numbers alone.
Can This Test Be Done at Home?
No, this test requires a clinical blood draw and cannot be performed at home without medical supervision.
  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