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Monocyte count (per microliter of whole 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 inflammation in your body.

Quick summary

["Monocytes help protect your body by identifying and responding to harmful substances."]

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

Key facts at a glance

LOINC
17835-0
Short code
Monocytes NFr Snv
Synonyms
Monocytes NFr 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

What Is a Monocyte Count Used For?

Doctors may order a monocyte count to diagnose or monitor conditions like infections, certain cancers (such as leukemia), autoimmune diseases, or chronic inflammatory disorders. It can also help assess how well your immune system is functioning or detect unusual immune responses.

When Might You Need This Test?

You might need this test if you have symptoms like frequent infections, unexplained weight loss, fatigue, or if your doctor suspects an immune-related condition. It’s also part of routine blood work in some cases, especially if you have ongoing health concerns.

How Is the Test Performed?

A small sample of your blood is drawn from a vein, usually in your arm. The sample is then analyzed in a lab to count the number of monocytes present in your bloodstream.

What Do Results Mean?

Results show the number of monocytes in your blood, measured in cells per microliter. Higher or lower than expected counts may signal underlying health issues that need further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Monocyte blood test

Frequently asked questions

Why might my doctor want to check my monocyte count?
Your doctor may check your monocyte count to help diagnose conditions like infections, autoimmune diseases, or blood disorders, or to monitor your treatment progress if you already have one of these conditions.
What are the typical reference ranges for monocyte counts?
Reference ranges vary by lab, but healthy adults typically have between 100 and 700 monocytes per microliter of blood. Your specific range may differ based on age, health status, and other factors.
Can lifestyle changes affect monocyte counts?
Yes, factors like stress, diet, sleep, and certain medications can influence white blood cell counts, including monocytes. Maintaining good health habits may support balanced immune function.
  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