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White Blood Cell Differential (with Additional Blood Cell Analysis)

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

This test measures the types and counts of white blood cells (WBCs) in your blood, along with additional blood cell components beyond just the WBC count.

Quick summary

["It helps identify infections, immune responses, or blood disorders by examining your blood’s cellular makeup."]

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

Key facts at a glance

LOINC
30406-3
Short code
WBC Other # Bld
Synonyms
WBC Other # Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
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
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 order this test to diagnose or monitor conditions like infections (e.g., bacterial or viral), autoimmune diseases, blood disorders (e.g., leukemia), or to check for signs of inflammation or immune system issues. It may also be used before surgeries or treatments that affect the immune system.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your arm to draw blood, similar to a routine blood draw. If you’re on blood thinners, let your doctor know before the test.

What the Test Results Mean

The test provides counts for different types of white blood cells (neutrophils, lymphocytes, monocytes, eosinophils, basophils) and may include counts for red blood cells, platelets, or other blood components. Abnormal results can signal infections, allergies, or other health issues.

Common Conditions Monitored

This test helps track conditions such as chronic infections, immune deficiencies, or blood cancers. It may also assess how your body responds to treatments like chemotherapy or steroids.

Reference range

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

Specimen: whole-blood

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

WBC Differential (with Other Blood Cells)

Frequently asked questions

What does a ‘WBC other blood’ test include?
It includes a detailed breakdown of white blood cells (differential) and additional blood cell measurements, such as red blood cells, platelets, or hematocrit, to provide a fuller picture of your blood’s cellular composition.
Can fasting affect this test?
No, fasting is generally not required for this test. However, if you have questions about diet or medications, discuss them with your doctor.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your doctor will explain the findings in detail during your follow-up.
  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