Leukocyte Count with Differential (Serum/Plasma Mass Concentration)
This test measures the total number of white blood cells (WBCs) in your blood and breaks them down into specific types (neutrophils, lymphocytes, monocytes, eosinophils, and basophils). It helps assess immune function and response to infection or inflammation.
["Understanding your white blood cell counts can help identify infections, immune disorders, or other health concerns."]
Key facts at a glance
- LOINC
- 59294-9
- Short code
- Levamisole Tiss-mCnt
- Synonyms
- Levamisole Tiss-mCnt
- 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 diagnose or monitor conditions such as infections (like bacterial or viral infections), autoimmune diseases, blood disorders, or to check for signs of cancer. It can also be used during pregnancy, before surgeries, or to evaluate chronic illnesses like leukemia or lymphoma.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if blood is drawn from a vein (venipuncture), but this depends on your doctor’s instructions. If you’re taking certain medications, mention them to your healthcare provider.
How the Test Is Performed
A healthcare professional will draw blood from a vein in your arm using a small needle. The blood sample is then sent to a lab, where it is analyzed to count and identify the different types of white blood cells.
What the Results Mean
Results show your total WBC count and the percentage of each type. For example, high counts may indicate infection or inflammation, while low counts could signal immune suppression or other health issues. Your doctor will interpret these results in the context of your overall health and symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
WBC with Differential
Frequently asked questions
What causes abnormal white blood cell counts?
How long does it take to get my results?
Can I eat or drink before 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