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White Blood Cell Count with Differential (Qualitative)

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

This test measures the types and proportions of white blood cells in your blood, helping identify infections, immune responses, or other conditions affecting your blood cells.

Quick summary

["Understanding your white blood cell types can help diagnose and guide treatment for infections or blood disorders."]

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

Key facts at a glance

LOINC
33052-2
Short code
WBC Ur Ql
Synonyms
WBC Ur Ql
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Ref low
4.5
Ref high
11
Critical range
2 N/A – 30 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85004
SNOMED
900000000000003002
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What Is a White Blood Cell Differential?

A white blood cell differential (or WBC differential) breaks down the total white blood cell count into specific types: neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Each type plays a unique role in your immune system.

Why Might You Need This Test?

This test is often used to diagnose infections (like bacterial or viral), autoimmune diseases, blood disorders (such as leukemia), or to monitor treatment effectiveness for conditions like cancer or chronic infections.

How Is This Test Performed?

A small blood sample is taken from your arm, usually by a needle. The sample is then examined under a microscope to count and identify the different types of white blood cells.

What Does the Test Result Mean?

Results show the percentage of each white blood cell type. For example, an elevated neutrophil count might suggest infection, while a high lymphocyte count could indicate a viral infection or immune response.

Reference range

Adult: 4.5-11.0 x 10^9/LN/A

Specimen: urine

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Changes in white blood cell counts or their proportions can signal underlying health issues. For instance, a low WBC count (leukopenia) may indicate immune suppression, while an abnormal differential could point to conditions like allergies, inflammation, or certain cancers. Your healthcare provider will interpret results in the context of your symptoms and medical history.

Short name

WBC Differential (Qual)

Frequently asked questions

What causes an abnormal white blood cell differential?
Abnormal differentials can result from infections (like pneumonia or sinusitis), autoimmune diseases (such as lupus), certain cancers (like leukemia), or medications that affect the bone marrow. Chronic conditions like diabetes or kidney disease may also influence these levels.
How often should I get this test?
Your doctor will determine how often you need this test based on your symptoms, medical history, or ongoing treatment. Routine blood tests may include this differential as part of general health checks or if you have a known condition affecting your immune system.
Can lifestyle changes affect white blood cell counts?
Yes, lifestyle factors like stress, poor sleep, diet, and smoking can influence white blood cell counts. Maintaining a balanced diet rich in vitamins (like vitamin C and zinc), staying hydrated, and managing stress may support healthy immune function, though this test alone won’t show direct lifestyle impacts without clinical correlation.
  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