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Monocyte Count (Peripheral Blood)

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

This test measures the number of monocytes, a type of white blood cell, in your blood. Monocytes help fight infections and inflammation.

Quick summary

["Understanding your monocyte count can help identify immune or inflammatory conditions."]

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

Key facts at a glance

LOINC
40544-9
Short code
Monocytes NFr Bronch Manual
Synonyms
Monocytes NFr Bronch Manual
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Doctors may order a monocyte count to diagnose or monitor conditions like infections, certain cancers (e.g., leukemia), autoimmune diseases, or chronic inflammatory disorders. It can also help assess how your body is responding to treatment.

What Does a High or Low Count Mean?

A high monocyte count may suggest chronic inflammation, infections, or certain cancers. A low count could indicate immune suppression, certain blood disorders, or side effects from medications.

How Is This Test Performed?

A small blood sample is taken from your arm, usually by a needle. The sample is then analyzed in a lab to count the number of monocytes.

What Are Common Results?

Results are typically reported as the absolute number of monocytes per microliter (µL) of blood. Your doctor will interpret the results in relation to your overall health and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Monocyte Level

Frequently asked questions

What does a normal monocyte count mean for my health?
A normal monocyte count doesn’t necessarily mean you’re healthy, but it suggests your immune system is functioning within typical ranges. If you have symptoms or risk factors, further testing may be needed to explore potential causes.
Can lifestyle changes affect monocyte levels?
Yes, certain lifestyle factors like diet, stress, and physical activity can influence white blood cell counts, including monocytes. Maintaining a balanced diet, managing stress, and staying active may support overall immune health.
How often should I get this test if I have a known condition?
Your doctor will determine how often to check your monocyte count based on your specific condition, symptoms, and treatment plan. Regular monitoring helps track changes and adjust care as needed.
  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