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Lymphocyte Count in Fluid (Manual Cell Count)

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

This test measures the number of lymphocytes, a type of white blood cell, in a blood sample. Lymphocytes help fight infections and maintain immune function.

Quick summary

["Lymphocyte counts help assess immune health and detect potential infections or immune disorders."]

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

Key facts at a glance

LOINC
6744-7
Short code
Lymphocytes # Fld Manual
Synonyms
Lymphocytes # Fld Manual
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
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 Is a Lymphocyte Count Used For?

Lymphocytes are part of your immune system and play a key role in defending your body against infections and diseases. This test helps doctors evaluate your immune status, especially if you have symptoms like frequent infections, fatigue, or unexplained weight loss. It may also be used to monitor conditions like leukemia, HIV, or autoimmune diseases.

How Is This Test Performed?

Blood is drawn from a vein, typically in your arm. The sample is then examined under a microscope by a trained technician to count lymphocytes manually. This method provides a detailed count of different white blood cell types, including lymphocytes.

What Are Normal Results?

There are no specific reference ranges provided here since manual counts can vary based on lab standards and patient factors. Your doctor will interpret the results in relation to your overall health and medical history.

When Might You Need This Test?

Your doctor may order this test if you have symptoms suggesting an immune disorder, such as frequent or severe infections, unusual fatigue, or unexplained weight changes. It may also be part of routine monitoring for certain medical conditions or before certain treatments.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lymphocyte Count (Manual)

Frequently asked questions

Why might my lymphocyte count be checked regularly?
Regular checks may be needed if you have a chronic illness like HIV, cancer, or autoimmune diseases, or if you’re undergoing treatments that affect your immune system, such as chemotherapy or certain medications.
What could affect my lymphocyte count?
Several factors can influence lymphocyte counts, including infections, stress, certain medications, nutritional deficiencies, or underlying health conditions like diabetes or thyroid disorders.
Can I prepare for this test in any special way?
No special preparation is usually needed, but avoid heavy meals or strenuous activity right before your blood draw. Stay hydrated, but let your doctor know if you have any concerns or conditions that might affect the 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