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Leukocyte (White Blood Cell) Count with Differential Analysis (Serum/Plasma Mass Concentration)

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

This test measures the types and proportions of white blood cells in your blood, helping assess immune function and potential infections or inflammatory conditions.

Quick summary

["Understanding your white blood cell types can help diagnose or monitor health issues like infections, allergies, or immune disorders."]

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

Key facts at a glance

LOINC
59292-3
Short code
Levamisole Fld-mCnc
Synonyms
Levamisole Fld-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 This Test Is Done

Doctors may order this test to evaluate your immune system, check for infections (such as bacterial or viral), or monitor conditions like leukemia, autoimmune diseases, or chronic inflammation. It can also help diagnose allergies or reactions to medications.

How the Test Works

A small blood sample is taken, and the white blood cells are analyzed to count and identify different types (neutrophils, lymphocytes, monocytes, eosinophils, basophils). This process often involves microscopic examination or advanced automated techniques.

What to Expect Before the Test

No special preparation is needed, but inform your healthcare provider about any medications, recent illnesses, or conditions that might affect results. Avoid strenuous activity 24 hours before the test if possible.

What the Results Mean

Results show the absolute counts and percentages of each white blood cell type. Abnormal counts may indicate infections, immune disorders, or other health concerns that require further evaluation by a healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

WBC Differential Profile

Frequently asked questions

How long does it take to get results?
Results are typically available within 24 to 48 hours, depending on lab processing times and whether additional testing is needed.
Can I eat or drink before this test?
No special diet is required, but avoid heavy meals or alcohol before the blood draw to ensure accurate results.
Will this test show if I have a virus or infection?
This test provides general information about your immune system but may not directly identify specific viruses or infections. Additional tests, such as viral cultures or antibody tests, may be needed for diagnosis.
  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