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Monocyte Count

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

This test measures the number of monocytes, a type of white blood cell that helps your body fight infections and remove dead cells.

Quick summary

["Monocytes help protect your immune system and clear waste from your body."]

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

Key facts at a glance

LOINC
101147-7
Short code
Monocytes NFr Bld FC
Synonyms
Monocytes NFr Bld FC
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
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 Is a Monocyte Count Used For?

Doctors may order a monocyte count to check for infections, inflammation, or certain blood disorders. It can also help evaluate immune function or monitor conditions like leukemia or autoimmune diseases.

How Is This Test Done?

A small amount of blood is drawn from a vein, usually in your arm. The sample is then analyzed in a lab to count the monocytes among your white blood cells.

When Might You Need This Test?

You might need a monocyte count if you have symptoms like fever, fatigue, unexplained weight loss, or if you’re recovering from an illness. It’s also used in ongoing monitoring for chronic conditions.

What Do Results Mean?

Results show the number of monocytes per microliter of blood. High or low counts can signal different health issues, so your doctor will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Monocytes play a key role in immune response. Elevated counts may indicate chronic infections, inflammation, or certain cancers. Low counts could suggest immune deficiencies, bone marrow disorders, or severe infections. Your doctor will use these results to guide treatment or further testing.

Short name

Monocyte Blood Count

Frequently asked questions

Why do doctors check monocyte counts during infections?
Monocytes help fight infections by moving to areas of inflammation and breaking down dead cells. If they’re too high, it may signal an ongoing immune response or infection. If too low, it could mean your body isn’t producing enough immune cells to fight pathogens.
How long does it take to get monocyte test results?
Results are typically available within 1 to 3 business days, depending on lab processing times. Your doctor will contact you once they’re ready.
Can lifestyle changes affect monocyte counts?
Yes, stress, poor sleep, or certain medications (like steroids) can temporarily affect white blood cell counts, including monocytes. Eating a balanced diet and managing stress may support overall immune health, but results depend on your specific health condition.
  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