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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, in your blood. Monocytes help fight infections and inflammation.

Quick summary

["Knowing your monocyte count can help doctors assess immune function and detect underlying conditions."]

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

Key facts at a glance

LOINC
61125-1
Short code
Monocytes NFr Spec FC
Synonyms
Monocytes NFr Spec FC
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
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 test to diagnose or monitor conditions such as infections, inflammatory diseases, or blood disorders. It can also help evaluate immune responses or check for signs of leukemia or other cancers.

What to Expect Before the Test

No special preparation is needed for this test. A simple blood draw is performed, usually from a vein in your arm. The process is quick and typically painless.

What the Results Mean

Results are expressed as the number of monocytes per microliter (µL) of blood. While specific reference ranges vary by lab, abnormal counts may indicate immune system issues or other health concerns.

Common Conditions Monitored

High monocyte counts might suggest chronic infections, autoimmune diseases, or certain cancers. Low counts could indicate immune deficiencies or other blood disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Monocyte counts are part of a complete blood count (CBC) and are often reviewed alongside other blood cell types. They play a key role in identifying inflammation, infections, or immune system dysfunctions that may require further medical evaluation.

Short name

Monocyte Blood Test

Frequently asked questions

What causes a high monocyte count?
High monocyte counts can result from chronic infections, inflammatory diseases (like rheumatoid arthritis), certain cancers, or reactions to infections or vaccines. Stress or certain medications may also temporarily affect monocyte levels.
What causes a low monocyte count?
Low monocyte counts may occur due to immune deficiencies, certain medications, severe infections, or conditions like aplastic anemia. Chronic diseases or autoimmune disorders can sometimes lead to reduced monocyte production.
How often should I get this test?
The frequency depends on your health condition. Doctors may recommend monitoring monocyte counts periodically if you have ongoing health issues like chronic inflammation or blood disorders. Regular check-ups with your healthcare provider will guide this.
  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