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Lymphocyte count (qualitative flow cytometry)

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

This test evaluates the presence and proportion of lymphocytes, a type of white blood cell, in your blood sample using manual flow cytometry.

Quick summary

["Lymphocytes help fight infections and support immune function; this test helps assess your immune health qualitatively."]

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

Key facts at a glance

LOINC
71660-5
Short code
Lymphocytes NFr.DF CSF Manual
Synonyms
Lymphocytes NFr.DF CSF Manual
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like frequent infections, fatigue, or unexplained weight loss. It can also be used to monitor immune conditions or evaluate blood samples before certain treatments.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, typically drawn from your arm. The test involves analyzing cells in your blood under a microscope to count and identify lymphocytes.

What the Results Mean

Results are qualitative (yes/no or high/low presence) rather than numeric. A positive result indicates lymphocytes are present, while a negative result suggests they are absent or very low. Your provider will interpret results in the context of your symptoms and medical history.

Common Reasons for Testing

Lymphocyte count testing is often used to diagnose or monitor conditions like immune deficiencies, certain cancers (e.g., lymphoma), or infections. It may also be part of routine blood work for general health checks.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Lymphocyte count (qualitative)

Frequently asked questions

What does a low or high lymphocyte count indicate?
A low lymphocyte count may suggest immune suppression, chronic illness, or certain medications that affect white blood cells. A high count could indicate overactive immune responses, infections, or certain blood disorders. Always discuss results with your provider.
How often should I get this test?
Frequency depends on your medical condition and provider’s recommendations. Some patients get this test annually or more often if they have ongoing health concerns or are undergoing treatment.
Can lifestyle changes affect lymphocyte counts?
Yes, diet, stress, and sleep can influence immune function. Maintaining a balanced diet, managing stress, and staying hydrated may support healthy lymphocyte levels, but results are best interpreted with medical guidance.
  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