Granulocyte Count (Manual Differential Blood Count)
This test measures the number and types of white blood cells called granulocytes, which include neutrophils, eosinophils, and basophils, in your blood. It helps assess immune function and identify infections or inflammatory conditions.
["Granulocyte counts help diagnose and guide treatment for infections, allergies, or immune disorders."]
Key facts at a glance
- LOINC
- 14377-6
- Short code
- Granulocytes NFr Smn Manual
- Synonyms
- Granulocytes NFr Smn Manual
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- manual-count
- 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
Why This Test Is Done
Doctors may order this test to evaluate your immune system, check for infections (such as bacterial or fungal), or monitor conditions like chronic inflammation, autoimmune diseases, or blood disorders. It can also help diagnose certain types of leukemia or other blood cancers.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into a vein (usually in your arm) to draw blood. The process takes a few minutes, and you may feel a brief pinch. If you’re nervous, let your healthcare provider know.
What the Test Results Mean
Results show the percentage of granulocytes (neutrophils, eosinophils, and basophils) among all white blood cells. Abnormal counts may indicate infections, allergies, or immune system issues. Your doctor will interpret results in the context of your overall health.
Common Conditions This Test Helps Diagnose
High granulocyte counts might suggest infections, inflammation, or stress responses. Low counts could indicate immune deficiencies, certain cancers, or medications that suppress white blood cells. Always discuss results with your doctor.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Granulocyte Differential
Frequently asked questions
How long does it take to get my granulocyte test results?
Can I eat or drink before this test?
What does it mean if my granulocyte count is very high or very low?
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