Neutrophil Immature-to-Total Neutrophil Ratio (Blood)
This test compares the proportion of immature (band) neutrophils to total neutrophils in your blood. It helps assess bone marrow function and potential infection responses.
["Evaluates your body’s ability to produce mature white blood cells for infection defense."]
Key facts at a glance
- LOINC
- 90223-9
- Short code
- Neut.immature/Neut.total NFr.DF Bld
- Synonyms
- Neut.immature/Neut.total NFr.DF Bld
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 This Test Measures
The test looks at two types of white blood cells called neutrophils: **immature (band) neutrophils** and **total neutrophils**. Immature neutrophils are newer, less mature cells that may indicate active bone marrow activity or stress responses. The ratio helps doctors understand whether your bone marrow is working normally or if there’s an issue like infection, inflammation, or a blood disorder.
Why It Might Be Ordered
Your doctor may order this test if you have symptoms like fever, rapid breathing, or signs of infection (e.g., sore throat, skin rashes). It can also be used to monitor conditions like leukemia, severe infections, or after chemotherapy to check bone marrow recovery.
Sample Collection and Preparation
A small blood sample is drawn from a vein, usually in your arm. The blood is sent to a lab for analysis. No special preparation is needed, but fasting may not be required unless instructed by your provider.
What to Expect Before the Test
You may feel slight discomfort or bruising at the injection site, but the procedure takes only a few minutes. Avoid strenuous activity for 24 hours afterward to prevent excessive bleeding.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Immature Neutrophil Ratio
Frequently asked questions
An elevated ratio may suggest overactive bone marrow (e.g., infection, inflammation, or certain cancers). A low ratio could indicate suppressed bone marrow function (e.g., chemotherapy side effects, anemia, or immune disorders). Always discuss results with your healthcare provider.
How often will I need this test? It depends on your health condition. Your doctor may repeat it if you’re undergoing treatment for a blood disorder or infection.
Is there anything I should avoid before this test? Avoid heavy meals or alcohol 2 hours before the draw, but no other restrictions apply unless advised by your doctor.
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