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White Blood Cell Differential (Manual Count) with Other Blood Components

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

This test measures the types and counts of white blood cells in your blood, along with other blood components, using a manual method for detailed analysis.

Quick summary

["It helps identify infections, immune system function, or blood disorders by examining cell types beyond just total white blood cell count."]

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

Key facts at a glance

LOINC
729-4
Short code
WBC Other # Bld Manual
Synonyms
WBC Other # Bld Manual
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
Method
manual-count
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 may order this test to diagnose or monitor conditions like infections, autoimmune diseases, blood cancers, or chronic illnesses. It can also help track treatment progress or uncover subtle changes in your blood that standard tests might miss.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood. If you’re on blood-thinning medication, let your provider know before the test.

What the Test Results Mean

The manual differential counts specific white blood cell types (neutrophils, lymphocytes, monocytes, eosinophils, basophils) and may include other components like platelets or hemoglobin. Abnormal results can signal infections, inflammation, or blood disorders.

Common Conditions Monitored

This test is often used to assess immune responses, detect infections (like bacterial or viral), evaluate blood disorders (e.g., anemia, leukemia), or monitor chronic conditions like lupus or rheumatoid arthritis.

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 & Other Blood Tests (Manual)

Frequently asked questions

How long does it take to get results from this manual test?
Manual differential results can take longer than automated tests (typically 24–48 hours or more) because they require microscopic review by a trained lab technician. Your provider will let you know once they’re ready.
What if my results show an unusual white blood cell count?
An unusual count may signal an infection, immune response, or blood disorder. Your doctor will review the full picture—including symptoms, other tests, and your medical history—to determine the next steps, such as additional testing or treatment adjustments.
Can I eat or drink before this test?
No dietary restrictions apply. You can eat and drink normally, but avoid alcohol the evening before if you’re on blood-thinning medications, as it may affect test results.
  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