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Monocyte Count (Qualitative Blood Differential)

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

This test checks the proportion of monocytes in your blood, a type of white blood cell that helps fight infections and inflammation.

Quick summary

["Monocytes help your body respond to chronic infections and injuries."]

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

Key facts at a glance

LOINC
11112-0
Short code
Monocytes NFr Mar Manual
Synonyms
Monocytes NFr Mar 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

What Is a Monocyte Count Used For?

Doctors may order this test to monitor immune function, assess chronic conditions like rheumatoid arthritis or lupus, or evaluate responses to treatments that affect white blood cells. It can also help diagnose or manage infections where monocytes play a key role.

How Is the Test Performed?

A small blood sample is drawn from your arm. The sample is then examined under a microscope to count and identify different types of white blood cells, including monocytes. This is typically done manually for accuracy.

What Does a Monocyte Count Tell You?

While this test provides a qualitative (not quantitative) assessment of monocyte presence, it helps determine if your immune system’s monocyte activity is within expected ranges for your condition. Elevated or low monocyte counts may suggest underlying health concerns.

When Might You Need This Test?

You might need this test if you have symptoms of chronic inflammation, recurrent infections, or if your doctor suspects an immune-related disorder. It can also be part of routine monitoring for certain diseases or treatments.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Monocytes in Health and Disease

Short name

Monocyte Screening

Frequently asked questions

Why might my doctor ask about this test?
Your doctor may use this qualitative assessment to guide treatment decisions, especially if you have conditions like autoimmune diseases, certain cancers, or if you’re undergoing therapies that affect white blood cells.
What are the typical results I should expect?
This test does not provide a specific numeric range. Instead, it helps identify whether monocyte levels are consistent with your clinical picture. Your doctor will interpret the results in the context of your overall health and symptoms.
Can I prepare for this test?
No special preparation is needed. However, inform your doctor about any medications or conditions that might affect your blood cells before the test.
  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