Skip to content

Lymphocyte Count (with Differential: Lymphocytes, Band Neutrophils)

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

This test measures the types and proportions of white blood cells called lymphocytes and immature neutrophils (band cells) in your blood. It helps evaluate immune function and inflammation.

Quick summary

["Understanding your blood’s immune cell balance can help diagnose infections, immune disorders, or other conditions."]

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

Key facts at a glance

LOINC
17096-9
Short code
Lymphs Kappa/lymph NFr Bld
Synonyms
Lymphs Kappa/lymph NFr Bld
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 check for infections (like bacterial or viral), immune system issues (such as lymphoma or leukemia), or reactions to treatments that affect white blood cells. It can also help monitor conditions like chronic inflammation or autoimmune diseases.

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, similar to a routine blood test. The process takes about 5 minutes, and you may feel a brief pinch or slight discomfort.

What the Results Mean

Results show the percentage of different white blood cells, including lymphocytes (a key part of your immune system) and band neutrophils (immature white cells that help fight infection). Abnormal counts may indicate infections, immune disorders, or other health concerns.

Common Conditions Linked to Abnormal Results

Low lymphocyte counts might suggest immune deficiencies, severe infections, or certain cancers. High lymphocyte counts could signal chronic infections, autoimmune diseases, or overactive immune responses. Band neutrophils may rise during acute infections or stress.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Lymphocyte Differential (Blood)

Frequently asked questions

How often will I need this test?
Your doctor will determine frequency based on your symptoms, diagnosis, or ongoing treatment. Some patients need it monthly or less often, while others may need it more regularly.
What if my results are outside the normal range?
Your doctor will discuss the results with you, including any potential causes and next steps. They may recommend further testing or adjustments to your treatment plan if needed.
Can I eat or drink before this test?
You can eat and drink normally before this test, as it doesn’t require fasting. However, always follow your doctor’s specific instructions for your situation.
  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