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White Blood Cell Differential with Fetal Cell Analysis (Serum/Plasma)

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

This test measures the types of white blood cells in your blood and checks for fetal cells in your serum or plasma. It helps assess immune function and detect potential pregnancy-related conditions.

Quick summary

["This test combines a white blood cell count analysis with fetal cell screening in your blood sample."]

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

Key facts at a glance

LOINC
67836-7
Short code
WBC Other # Plr Fetus
Synonyms
WBC Other # Plr Fetus
Category
chemistry
Sample
fluid
Container
Sterile tube
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
CPT
85004
SNOMED
900000000000003002
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

What Does This Test Measure?

The test evaluates the proportions of different white blood cell types (neutrophils, lymphocytes, monocytes, eosinophils, basophils) in your blood. Additionally, it screens for fetal cells (human chorionic gonadotropin or other markers) that may indicate pregnancy-related conditions.

Why Might You Need This Test?

A complete white blood cell differential is often ordered to diagnose or monitor conditions like infections, immune disorders, or blood disorders. The fetal cell screening component may be used in pregnancy to assess risks of complications such as miscarriage or chromosomal abnormalities.

How Is the Test Performed?

A blood sample is drawn from a vein, typically in your arm. The sample is then analyzed in a lab to count and identify the different white blood cell types and check for fetal cell markers.

What Are Common Reasons for This Test?

Common reasons include diagnosing infections, evaluating immune system health, monitoring chronic conditions like leukemia, or screening for pregnancy-related complications.

Reference range

Adult: 4.5-11.0 x 10^9/LN/A

Specimen: fluid

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

WBC Differential (Fetal Cells)

Frequently asked questions

What does a white blood cell differential tell me about my health?
A white blood cell differential helps identify the types and proportions of white blood cells in your blood. Elevated or low levels of specific cell types can signal infections, allergies, autoimmune diseases, or other health issues. Your doctor will interpret the results in the context of your symptoms and medical history.
How do fetal cells in my blood relate to my pregnancy?
Fetal cells in your blood may indicate the presence of pregnancy-related substances. If detected, this could be part of screening for pregnancy complications, such as miscarriage risks or chromosomal abnormalities. Your healthcare provider will discuss the results and next steps with you.
What should I do if my test results are abnormal?
If your results show abnormalities, your healthcare provider will review them with you and may recommend further testing, lifestyle changes, or additional medical evaluation. Follow-up care is tailored to your specific needs and symptoms.
  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