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Pathology report with comprehensive blood cell differential analysis (including lymphocyte subsets)

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

This test provides detailed information about the types and proportions of cells in your blood, including white blood cells and their subtypes.

Quick summary

["Understanding your blood cell counts helps identify infections, immune disorders, or other health conditions."]

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

Key facts at a glance

LOINC
66112-4
Short code
LN Path Bx report
Synonyms
LN Path Bx report
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

What This Test Measures

The test includes a full blood cell differential, which breaks down the different types of white blood cells (WBCs) in your blood. This includes measuring absolute counts for neutrophils, lymphocytes, monocytes, eosinophils, and basophils. It may also include specialized lymphocyte subsets (e.g., T-cells, B-cells) if requested.

Why It Matters in Your Health

Blood cell differentials help doctors diagnose conditions like infections, autoimmune diseases, or blood disorders. For example, high or low counts of certain WBCs can signal infections, allergies, or immune system issues.

Common Uses for This Test

This test is often used during routine check-ups, to monitor chronic conditions (like leukemia or HIV), or to investigate symptoms such as fever, fatigue, or unexplained weight loss.

What to Expect Before the Test

No special preparation is needed. A simple blood draw from your arm is all that’s required. If you’re on blood-thinning medications, let your doctor know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

How might abnormal results affect my health?
Abnormal blood cell counts can indicate infections, immune disorders, or other health problems. For example, low lymphocyte counts may suggest weakened immunity, while high eosinophil counts could point to allergies or parasitic infections. Your doctor will discuss these findings with you in detail.
Will I need to take any medications after the test?
No, you won’t need any special medications unless your doctor prescribes them based on your test results. Follow-up care depends entirely on your doctor’s recommendations.
How often should I get this test?
The frequency depends on your health status. Routine blood tests may be done annually, while people with chronic conditions might need more frequent monitoring. Always follow your doctor’s advice.
  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