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Lymphocyte count in fetal blood

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

This test measures the number of lymphocytes (a type of white blood cell) in a sample of your baby’s blood. It helps assess immune function and potential risks during pregnancy.

Quick summary

["Lymphocytes in fetal blood can indicate immune health and developmental concerns."]

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

Key facts at a glance

LOINC
74461-5
Short code
Lymphocytes NFr Bld Fetus
Synonyms
Lymphocytes NFr Bld Fetus
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 is this test done?

Doctors may order this test if there are concerns about fetal immune development, genetic conditions, or exposure to certain medications or infections that could affect white blood cell counts. It may also be part of a broader evaluation for fetal anomalies or complications like intrauterine growth restriction.

What does the result mean?

Lymphocyte counts in fetal blood can vary widely, and a result may be considered low, normal, or high depending on medical context. Abnormally low counts might suggest immune deficiencies or other developmental issues, while very high counts could indicate infections or other conditions. Your healthcare provider will interpret the result in relation to your specific situation.

How is the test performed?

A small sample of fetal blood is typically collected through procedures like chorionic villus sampling (CVS) or amniocentesis. The blood is analyzed in a lab to count the lymphocytes and other white blood cells.

What preparation is needed?

No special preparation is usually required, but you may need to follow instructions from your healthcare provider regarding diet, hydration, or avoiding certain medications before the procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance

Short name

Fetal Lymphocyte Count

Frequently asked questions

What might abnormal results mean?
Low lymphocyte counts in fetal blood may raise concerns about immune system development or potential genetic syndromes. High counts could signal infections, immune disorders, or other conditions affecting fetal health. Always discuss results with your doctor, as they will consider your medical history and other test results to guide next steps.
How often is this test repeated?
The frequency depends on your pregnancy’s stage and medical needs. Your healthcare provider will determine if follow-up testing is necessary based on initial results and ongoing monitoring.
Can lifestyle or diet affect this test?
While lifestyle factors like diet or stress may influence white blood cell counts in adults, fetal blood tests are performed on samples collected during specific medical procedures. Your doctor will ensure the sample is representative of your baby’s current health.
  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