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Absolute Monocyte Count (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 regulate immune responses.

Quick summary

["Monocytes help protect your body from infections and inflammation; this test checks their levels in your blood."]

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

Key facts at a glance

LOINC
26484-6
Short code
Monocytes # Bld
Synonyms
Monocytes # Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test to evaluate your immune system, check for infections, monitor conditions like chronic inflammation, or assess blood disorders such as leukemia or other blood-related diseases. It can also help diagnose or monitor conditions like rheumatoid arthritis, lupus, or other autoimmune disorders.

What to Expect Before the Test

No special preparation is needed for this test. You’ll have a small needle inserted into your arm or hand to draw a blood sample. The process is quick and usually painless. If you’re nervous, let your healthcare provider know so they can help make it more comfortable.

What Happens During the Test?

A healthcare professional will clean the area with an antiseptic, insert a needle into your vein, and collect a small amount of blood into a test tube. The blood sample is then sent to a lab for analysis. The test usually takes a few minutes, and you may feel a brief pinch or slight discomfort.

What Does the Test Result Mean?

Results are reported as the number of monocytes per microliter (µL) of blood. High or low monocyte counts can indicate different health issues, such as infections, inflammatory diseases, or certain blood disorders. Your doctor will discuss the results with you in the context of your overall health and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Monocyte Blood Count

Frequently asked questions

What Are Common Causes of Abnormal Monocyte Levels?
Elevated monocyte counts (hypermonocytosis) can occur with chronic infections, inflammatory diseases (like rheumatoid arthritis or lupus), or certain cancers. Low monocyte counts (hypomonocytosis) may suggest immune deficiencies, severe infections, or certain blood disorders. Always consult your doctor for an accurate interpretation based on your symptoms and medical history.
How Often Should I Get This Test?
The frequency of this test depends on your medical condition and why it was ordered. If you have an ongoing health issue, your doctor may recommend regular monitoring. If this test is part of a routine checkup, it may not be done as often.
Can I Eat or Drink Before This Test?
You can eat and drink normally before this test unless your doctor has specific instructions. No fasting is required for this blood 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