Understanding This Medical Test: A Patient Guide to Testing, Results, and Next Steps
This test measures the number of monocytes in your blood, a type of white blood cell that helps your body fight infections and support immune function.
{"Monocytes are white blood cells that help fight infection and support immune health","This test shows whether your monocyte count is normal, high, or low","Results help doctors diagnose infections, inflammatory conditions, or blood disorders","A small blood sample is drawn from a vein in your arm","Abnormal results may require additional testing but don't always mean a serious problem"}
Key facts at a glance
- LOINC
- 29260-7
- Short code
- MONO
- Synonyms
- Abn Monocytes # Bld Manual
- Category
- chemistry
- Sample
- whole-blood
- Container
- EDTA (K2 or K3) lavender/purple top vacuum tube
- Units
- N/A
- Ref low
- 2
- Ref high
- 10
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- manual-count
- CPT
- 85005
- SNOMED
- 257521006
- Specimen volume
- 3-5 mL whole blood in EDTA tube; minimum 1 mL for pediatric samples
- Stability
- Room temperature (20-25°C): 24-48 hours; Refrigerated (2-8°C): up to 72 hours. Do not freeze. Mix gently by inversion 8-10 times immediately after collection.
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 2–24 hours
- Order
- routine
This is a laboratory test in which a sample of your blood, urine, or other body material is analyzed to check how well your body is working or to look for signs of a medical condition. Your doctor uses the results together with your symptoms, medical history, and physical examination to make an accurate diagnosis and plan your care.
The monocyte count test measures the number of monocytes in your blood. Monocytes are a type of white blood cell (leukocyte) that plays an important role in your immune system. They help fight infections by engulfing and destroying harmful microorganisms, and they also help coordinate immune responses.
Your healthcare provider may order this test to help diagnose a health problem, monitor an ongoing condition, check how well a treatment is working, or screen for certain diseases before symptoms appear. It can also be part of a routine checkup to confirm that organs such as your kidneys, liver, and heart are functioning normally.
Your doctor may order a monocyte count as part of a complete blood count (CBC) to check your overall health, or to help diagnose conditions such as infections, inflammatory diseases, or blood disorders like leukemia. It may also be used to monitor certain medical conditions or treatments that affect white blood cell counts.
The procedure depends on the type of sample needed. Most often, a healthcare professional draws a small amount of blood from a vein in your arm using a thin needle, which usually takes only a few minutes. For other tests, you may be asked to provide a urine sample, have a swab taken, or undergo a small tissue sample collection. After the sample is sent to the laboratory, you can usually return to your normal activities right away.
A healthcare professional will draw a small sample of blood from a vein in your arm using a needle. The blood sample is then sent to a laboratory for analysis. The test is usually quick and may cause minor discomfort or bruising at the puncture site.
Your results will be compared with standard reference ranges, and values that are higher or lower than normal may point to an infection, inflammation, organ dysfunction, or another condition that needs further evaluation. Keep in mind that a single abnormal value does not always mean you are seriously ill, since factors such as medications, diet, and hydration can affect the numbers. Your healthcare provider will review the findings with you, explain what they mean in the context of your overall health, and recommend any additional testing or treatment if needed.
Monocyte counts can be reported as an absolute number (cells per microliter of blood) or as a percentage of total white blood cells. Your results will be compared to a normal reference range, which may vary slightly depending on the laboratory. Both high and low monocyte counts can have various causes and may require further investigation.
Reference range
Monocytes: 2-10% of total leukocytes (absolute: 0.20-1.00 x 10^9/L). Reference ranges may vary slightly by laboratory methodology and instrument. Values outside this range may indicate infection, inflammation, hematologic disorder, or malignancy.N/A
No fasting required. Patient should be well-hydrated. Inform laboratory of current medications, especially corticosteroids, which may affect monocyte counts. Recent infections or immune disorders should be reported.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated monocyte counts (monocytosis) may indicate: bacterial infections, viral infections, chronic inflammatory conditions (such as rheumatoid arthritis or lupus), certain blood cancers (like chronic myelomonocytic leukemia), or recovery from an acute infection. Reduced monocyte counts (monocytopenia) may be seen with bone marrow disorders, certain infections like HIV, chemotherapy, or immunosuppressive medications. Your doctor will interpret your results in context with your overall health, symptoms, and other test findings.
Frequently asked questions
Do I need to fast before this test?
Is the test dangerous?
What happens if my monocyte count is abnormal?
Can medications affect my monocyte count?
Sources
- 1
- 2
- 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