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Monocyte count (qualitative blood smear evaluation)

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

This test evaluates the presence and proportion of monocytes in your blood sample through microscopic examination of stained blood cells. It helps assess immune system function and identify potential blood disorders.

Quick summary

["A qualitative check of your blood’s monocyte cells to support diagnosis of immune or blood-related conditions."]

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

Key facts at a glance

LOINC
71659-7
Short code
Monocytes NFr.DF CSF Manual
Synonyms
Monocytes NFr.DF CSF Manual
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

Monocytes are a type of white blood cell involved in immune response and inflammation. This test examines their number and appearance under a microscope, often as part of a complete blood count (CBC) review. The manual method ensures detailed visual assessment of cell morphology.

Why It’s Done

Your healthcare provider may order this test if you have symptoms like fatigue, fever, or unexplained infections. It can also help diagnose conditions such as leukemia, infections, or immune deficiencies by confirming abnormal monocyte levels or shapes.

Sample Collection and Process

A small blood sample is drawn from a vein, typically in your arm. The blood is then spread on a microscope slide and stained to highlight cell structures. A trained technician examines the slide under a microscope to count and evaluate monocytes.

What to Expect Before the Test

No special preparation is needed, but avoid strenuous activity or eating heavy meals 1 hour before the blood draw. Wear comfortable clothing and inform your provider of any medications or conditions that might affect results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Monocyte Check

Frequently asked questions

How might abnormal monocyte levels affect my health?
High monocyte counts may signal chronic infections, inflammation, or certain cancers. Low counts could indicate immune suppression, autoimmune disorders, or blood disorders like aplastic anemia. Always discuss results with your healthcare provider for personalized interpretation.
What does a ‘qualitative’ result mean?
A qualitative result describes the presence, absence, or relative proportion of monocytes rather than providing a specific numeric value. It helps identify whether monocyte levels or shapes appear abnormal compared to typical blood cell patterns.
Can I get this test at home?
No, this test requires a blood sample collected by a healthcare professional in a clinical setting. Manual smear evaluation is typically performed in a lab or hematology department.
  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