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Monocyte count (absolute)

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

This test measures the number of monocytes, a type of white blood cell that helps fight infection and inflammation in your body.

Quick summary

["Monocytes help your immune system respond to illness and injury."]

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

Key facts at a glance

LOINC
35027-2
Short code
Monocytes # Prt
Synonyms
Monocytes # Prt
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

What Is a Monocyte Count?

Monocytes are a type of white blood cell that plays a key role in your immune system. They help your body fight infections, respond to inflammation, and remove damaged cells. This test checks how many monocytes are present in your blood.

Why Might You Need This Test?

Your doctor may order a monocyte count to diagnose or monitor conditions like chronic infections, certain cancers (such as leukemia), autoimmune diseases, or to check for signs of immune system problems.

How Is the Test Performed?

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

What Do the Results Mean?

Results may be reported as a count of monocytes per microliter (µL) of blood. High or low monocyte counts can signal different health concerns, so 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

Why might my monocyte count be checked during my blood tests?
Your doctor may check monocyte levels to help diagnose or monitor conditions like chronic infections (e.g., tuberculosis), certain cancers (such as lymphoma or leukemia), or inflammatory diseases. Low monocyte counts might suggest immune deficiencies or severe infections, while high counts could indicate chronic inflammation or certain infections.
What are the typical reference ranges for monocyte counts?
Reference ranges can vary by lab and individual health. Your doctor will use your specific results along with your medical history and symptoms to guide treatment.
How often should I get a monocyte count test?
Your doctor will determine how often you need this test based on your health condition, symptoms, and treatment plan. Regular monitoring may be needed if you have an ongoing medical issue.
  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