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Monocyte Count in Blood (Manual Cell Count)

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

This test measures the number of monocytes, a type of white blood cell that helps your body fight infections and respond to inflammation. Monocytes are part of your immune system and play a role in long-term immune responses.

Quick summary

["Understanding your monocyte count helps doctors assess immune function and detect potential infections or inflammatory conditions."]

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

Key facts at a glance

LOINC
10330-9
Short code
Monocytes NFr Fld Manual
Synonyms
Monocytes NFr 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
CPT
86430
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 It’s Done

Doctors may order this test if you have symptoms like fever, fatigue, or unexplained infections. It can also be used to monitor conditions such as chronic inflammation, certain cancers, or immune disorders. Sometimes, it’s part of a routine blood check to evaluate overall immune health.

How It Works

Blood is drawn from a vein, usually in your arm. The sample is then examined under a microscope by a trained technician to count monocytes. This manual method provides a precise count without relying on automated equipment.

What to Expect

The process is quick and typically painless. You may feel a slight pinch when the needle is inserted, but most people tolerate it well. Results are usually available within a few days, depending on lab processing times.

What the Results Mean

A high monocyte count may indicate an ongoing infection, inflammation, or autoimmune condition. A low monocyte count could suggest immune suppression, certain blood disorders, or advanced age-related changes. Your doctor will interpret results 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 Level

Frequently asked questions

How long does it take to get my results?
Results are typically ready within 2 to 5 business days, depending on your lab’s processing schedule. Some labs may offer same-day or next-day results for urgent cases. Always confirm with your healthcare provider for your specific timeline.
Can I prepare for this test?
No special preparation is needed. You can eat, drink, or take your usual medications as usual. Avoiding strenuous activity or fasting isn’t required for this test.
Will I feel any discomfort during the blood draw?
You may feel a slight pinch or sting when the needle is inserted, but most people describe it as mild. Afterward, there may be a small bruise or slight swelling at the site. If you’re anxious, let your healthcare provider know so they can take extra precautions.
  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