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Myelocyte count (manual differential blood count)

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

This test measures the number of immature white blood cells called myelocytes in your blood. These cells are part of your body’s immune system and help produce mature white blood cells.

Quick summary

["Myelocytes are key to understanding blood cell development and potential blood disorders."]

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

Key facts at a glance

LOINC
71667-0
Short code
Myelocytes NFr.DF Bld Manual
Synonyms
Myelocytes NFr.DF Bld Manual
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
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 This Test Is Done

Doctors may order a myelocyte count to evaluate blood disorders, such as leukemia or other bone marrow conditions. It can also help monitor treatments for blood-related diseases or check for infections that might affect white blood cell production.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your vein (usually in your arm) to draw a blood sample. The test is quick and typically done in a doctor’s office or lab.

How the Test Works

A trained lab technician will examine your blood sample under a microscope to count myelocytes manually. This method provides detailed information about the types and numbers of immature white blood cells present.

What the Results Mean

Results are reported as a count of myelocytes per microliter (µL) of blood. Abnormal counts may indicate conditions affecting bone marrow function, such as overproduction or underproduction of blood cells.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated myelocyte counts may suggest conditions like myeloproliferative disorders or infections. Low counts could indicate bone marrow suppression, severe infections, or certain cancers. Always discuss results with your healthcare provider for personalized interpretation.

Short name

Myelocyte count

Frequently asked questions

What causes abnormal myelocyte counts?
Abnormal myelocyte counts can result from infections, inflammatory diseases, certain cancers (like leukemia), or treatments that affect bone marrow function. Your doctor will consider your full medical history and other test results to determine the cause.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on lab processing times. Your healthcare provider will contact you once they are ready to discuss the findings.
Can lifestyle changes affect myelocyte counts?
While diet and exercise generally don’t directly impact myelocyte counts, they can influence overall blood health. Avoiding smoking, managing stress, and staying hydrated may support healthy blood cell production, but this test is primarily for diagnostic purposes.
  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