Abnmonocytesbld
A monocyte count test measures the number of monocytes, a type of white blood cell, in your blood to help evaluate your immune system health.
{"Monocytes are white blood cells that help fight infections","Abnormal counts may indicate infections, inflammation, or blood disorders","The test is performed on a blood sample from your arm","Results are compared to normal reference ranges based on age and sex"}
Key facts at a glance
- LOINC
- 30440-2
- Short code
- MONO#
- Synonyms
- Abn Monocytes # Bld
- Category
- chemistry
- Sample
- whole-blood
- Container
- EDTA tube (purple top, K2-EDTA or K3-EDTA)
- Units
- N/A
- Ref low
- 0.2
- Ref high
- 1
- Critical range
- 0.05 N/A – 15 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- Automated flow cytometry or impedance cell counting on hematology analyzer
- CPT
- 85049
- SNOMED
- 59872001
- Specimen volume
- 3-5 mL of whole blood
- Stability
- Room temperature: 24-48 hours. Refrigerated (2-8°C): up to 72 hours. Do not freeze. Mix gently by inversion 8-10 times after collection.
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 1–4 hours
- Order
- routine
What is this test?
A monocyte count is a blood test that measures the number of monocytes in your bloodstream. Monocytes are a type of white blood cell (leukocyte) that play a crucial role in your immune system. They help defend your body against infections by engulfing and destroying foreign particles, dead cells, and microorganisms. This test is usually part of a complete blood count (CBC) with differential, which examines the different types of white blood cells in your blood.
Reference range
Reference range: 0.20-1.00 x10^9/L (200-1000 cells/μL). This represents approximately 2-10% of total white blood cell count. Reference ranges may vary slightly by laboratory methodology and instrument.N/A
No special preparation required. Fasting not necessary for this test. Inform laboratory of any current medications, especially corticosteroids or chemotherapy agents that may affect monocyte counts.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Why do I need this test?
How is the test performed?
Do I need to fast before the test?
What do abnormal results mean?
Sources
- 1
- 2
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