White Blood Cell Count in Fetal Blood (Automated Hematology Analysis)
This test measures the number of white blood cells in a sample of your baby’s blood, typically taken during pregnancy. It helps monitor fetal health and detect potential infections or immune system issues.
["A white blood cell count in fetal blood helps assess your baby’s immune system and overall health during pregnancy."]
Key facts at a glance
- LOINC
- 62239-9
- Short code
- WBC # Bld Fetus Auto
- Synonyms
- WBC # Bld Fetus Auto
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Ref low
- 4.5
- Ref high
- 11
- Critical range
- 2 N/A – 30 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- automated-count
- CPT
- 85004
- SNOMED
- 900000000000003002
- 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?
Your healthcare provider may order this test if you have concerns about fetal infections, immune disorders, or if your baby shows signs of distress during pregnancy. It can also be part of routine fetal monitoring in certain cases.
What Does the Test Involve?
A small sample of your baby’s blood is collected, usually through a procedure called a cord blood sample (during delivery) or via fetal blood sampling (amniocentesis). The blood is then analyzed using an automated machine to count white blood cells.
What Are the Results Meaningful For?
Elevated or low white blood cell counts in fetal blood may signal infections (like toxoplasmosis or cytomegalovirus), immune deficiencies, or other conditions requiring prompt medical attention. Your provider will interpret results in the context of your pregnancy and overall health.
What to Expect Before the Test
If done during delivery, you may receive local anesthesia for the procedure. If done earlier in pregnancy, you might need to prepare by fasting or avoiding certain medications. Always follow your provider’s instructions.
Reference range
Adult: 4.5-11.0 x 10^9/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: Elevated or reduced fetal white blood cell counts can indicate underlying infections, immune system disorders, or other congenital conditions. Early detection allows for timely interventions, such as antibiotics or specialized care to support fetal health.
Short name
Fetal WBC Count
Frequently asked questions
When might I need this test during pregnancy?
What does a normal fetal white blood cell count look like?
Can I prepare for this test in any way?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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