Skip to content

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

["Monocytes are key immune cells that protect your body from illness and injury."]

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

Key facts at a glance

LOINC
13835-4
Short code
Monocytes NFr Prt Manual
Synonyms
Monocytes NFr Prt 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
CPT
86592
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 check for infections, certain blood disorders, or immune system issues. It can also help diagnose conditions like leukemia, lupus, or chronic inflammation.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood, similar to other blood tests. The process usually takes a few minutes.

What the Results Mean

Results are typically reported as the absolute number of monocytes per microliter (µL) of blood. High or low counts may signal underlying health concerns that need further evaluation.

Common Conditions Monitored

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

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps identify whether your immune system is functioning normally or if there are signs of infection, inflammation, or a blood disorder that requires medical attention. It’s often used alongside other blood tests for a full picture of health.

Short name

Monocyte Count

Frequently asked questions

What does a high monocyte count mean?
A high monocyte count may suggest chronic inflammation, infections, or certain autoimmune conditions. Your doctor will discuss your results and next steps with you.
What does a low monocyte count mean?
A low monocyte count might indicate an immune deficiency or other blood disorders. Your doctor will review your results and recommend further testing if needed.
How often should I get this test?
The frequency depends on your health condition and doctor’s recommendations. Some people get it yearly, while others may need it more often if they have ongoing health concerns.
  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