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Monocyte count (per microliter of blood)

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

This test measures the number of monocytes, a type of white blood cell that helps fight infections and removes waste from your body.

Quick summary

["Monocytes help protect your immune system and keep your body healthy."]

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

Key facts at a glance

LOINC
30435-2
Short code
Monocytes # Snv
Synonyms
Monocytes # Snv
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why Might This Test Be Done?

Your healthcare provider may order this test to check for infections, certain blood disorders, or immune system issues. It can also help monitor conditions like leukemia, lymphoma, or chronic inflammatory diseases. Monocyte counts may be abnormal if you have infections, autoimmune disorders, or certain cancers.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or hand to draw a blood sample. This is usually quick and painless, though you might feel a slight pinch.

What the Test Results Mean

Results are reported as the number of monocytes per microliter (µL) of blood. High or low counts can signal different health concerns, so always discuss results with your provider.

Common Conditions Monitored

High monocyte counts may indicate chronic infections, inflammation, or certain cancers. Low counts could suggest immune deficiencies or blood disorders. Your provider will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Monocyte counts are important for diagnosing and managing conditions affecting the immune system, infections, or blood cell production. They help guide treatment plans for diseases like tuberculosis, rheumatoid arthritis, or blood cancers.

Short name

Monocyte Blood Count

Frequently asked questions

What causes a high monocyte count?
High monocyte counts can result from chronic infections (like tuberculosis or fungal infections), certain cancers (such as leukemia or lymphoma), or inflammatory diseases (like rheumatoid arthritis). Stress, pregnancy, or certain medications may also temporarily raise levels.
What causes a low monocyte count?
Low monocyte counts may occur with immune deficiencies, certain blood disorders (like aplastic anemia), or after chemotherapy/radiation treatment. Severe infections or bone marrow disorders can also lead to reduced monocyte production.
How often should I get this test?
Your provider will determine how often you need this test based on your health condition, symptoms, or treatment plan. Regular monitoring may be needed for chronic illnesses or after certain treatments.
  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