White Blood Cell Differential (Other Fields) – Fluid-Based Analysis
This test examines the types and proportions of white blood cells in a fluid sample (such as blood plasma or serum) to identify specific cell types beyond the standard complete blood count.
["It helps assess immune cell distribution in conditions affecting white blood cells beyond routine blood tests."]
Key facts at a glance
- LOINC
- 35051-2
- Short code
- WBC Other # Fld
- Synonyms
- WBC Other # Fld
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- 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
- 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 Might Be Ordered
Your doctor may recommend this test if they suspect conditions like infections, inflammatory diseases, or immune disorders that could affect specific white blood cell populations. It may also be used in research or specialized diagnostic scenarios where detailed cell analysis is needed.
What to Expect Before the Test
No special preparation is typically required. You may have a blood draw (for plasma/serum) or another fluid collection method, depending on the clinical context. Follow your healthcare provider’s instructions for fasting or avoiding certain medications if advised.
What the Test Measures
This test evaluates the concentration or presence of non-standard white blood cell types (e.g., atypical lymphocytes, eosinophils, or other rare cell forms) in fluid samples. Results are often compared to standard differential counts for context.
Common Conditions Monitored
This test can support diagnosis or monitoring of conditions like chronic infections, autoimmune diseases, or malignancies that alter white blood cell morphology. It may also be used in research or specialized settings where conventional tests are insufficient.
Reference range
Adult: 4.5-11.0 x 10^9/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
WBC Differential (Other Fluid)
Frequently asked questions
How might abnormal results affect my care?
What does it mean if my results are normal?
How often should I get this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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