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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 involved in immune response and inflammation. Monocytes help your body fight infections and remove damaged cells.

Quick summary

Monocytes support immune defense and inflammation regulation.

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

Key facts at a glance

LOINC
71614-2
Short code
Monocytes NFr.DF Plr Manual
Synonyms
Monocytes NFr.DF Plr Manual
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
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, autoimmune diseases, or certain cancers. It can also help assess how well your immune system is functioning or if there’s an abnormal buildup of these cells.

How Is This Test Done?

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 in your bloodstream.

What Might Affect My Results?

Several factors can influence monocyte levels, including recent infections, certain medications (like steroids), chronic illnesses, or even stress. If you’re taking medications or have a condition that affects your immune system, let your doctor know.

Common Reasons for Testing

A high monocyte count might suggest chronic infections, inflammation, or certain blood disorders, while a low count could indicate immune suppression or other underlying health issues. Your doctor will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Monocyte Level

Frequently asked questions

Why do I need this test?
Your doctor may recommend this test to check for immune system problems, monitor chronic conditions, or investigate symptoms like fatigue, fever, or unexplained weight loss.
What do my results mean?
Results alone don’t diagnose a condition. Your doctor will compare your monocyte count to your symptoms, medical history, and other test results to determine if further action is needed.
How soon will I get my results?
Results are typically available within 1 to 3 business days, depending on your lab. Follow up with your doctor to discuss the findings.
  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