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Monocyte Count in Fluid (Manual Count)

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

This test measures the number of monocytes, a type of white blood cell, in a fluid sample using a manual counting method. Monocytes help fight infections and inflammation.

Quick summary

["This test helps doctors assess immune function and monitor conditions affecting white blood cells."]

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

Key facts at a glance

LOINC
33251-0
Short code
Monocytes # Fld Manual
Synonyms
Monocytes # Fld 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

Why Is This Test Done?

Your doctor may order this test to evaluate your immune system, check for infections, or monitor certain blood disorders. It can also help diagnose conditions like leukemia, lymphoma, or chronic inflammation.

What Does the Test Involve?

A blood sample is taken from a vein, typically in your arm. The sample is then examined under a microscope by a trained professional to count the monocytes manually.

What Are Normal Results?

Normal results vary by lab and individual, but a typical range for monocyte count is between 0.1% and 1.0% of total white blood cells. Your specific reference range will be provided by your healthcare provider.

What Are Common Conditions Monitored?

Monocyte counts are often checked in patients with suspected infections, autoimmune diseases, or blood cancers. High levels may indicate chronic infections or inflammation, while low levels could suggest immune deficiencies or certain cancers.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Understanding Monocyte Counts

Short name

Monocyte Count (Manual)

Frequently asked questions

What factors might affect my test results?
Several factors can influence monocyte counts, including recent infections, certain medications (like steroids), chronic illnesses, or even stress. It’s important to inform your doctor about any medications or health conditions you have before the test.
How soon will I get my results?
Results from a manual monocyte count can take longer than automated tests, often 1–3 business days. Your doctor will discuss the results with you during your follow-up visit.
Can I prepare for this test?
No special preparation is needed for this test. However, avoid heavy meals before the blood draw to minimize discomfort. If you have any concerns or conditions that might affect the test, discuss them with your healthcare provider.
  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