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Fetal Platelet Count (Serum or Plasma)

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

This test measures the number of platelets in a sample of fetal blood, typically taken during prenatal care. Platelets help prevent bleeding and are important for fetal health.

Quick summary

["Platelets in fetal blood help assess bleeding risks and overall circulation during pregnancy."]

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

Key facts at a glance

LOINC
11806-7
Short code
Fet PA Diam US.meas
Synonyms
Fet PA Diam US.meas
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-measured
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

Why Is This Test Done?

Doctors may order this test if there are concerns about fetal bleeding, such as in cases of suspected placental abnormalities, maternal conditions affecting platelet function, or during certain prenatal screenings. It helps monitor fetal well-being and guide medical decisions.

How Is the Sample Collected?

A small amount of fetal blood is usually collected via amniocentesis or cord blood sampling during a prenatal procedure. The blood is then processed to measure platelet levels in serum or plasma.

What Does the Result Mean?

Results are compared to expected ranges for fetal platelet counts, though exact values may vary by lab. Low counts could signal bleeding risks, while high counts may indicate other conditions. Always discuss results with your healthcare provider.

Common Reasons for Testing

This test is often performed when there are risks of fetal bleeding, such as in cases of maternal conditions like thrombocytopenia, placental issues, or when monitoring high-risk pregnancies.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Abnormal platelet counts in fetal blood may indicate bleeding disorders, placental complications, or other underlying conditions that require further evaluation. High or low counts can influence decisions about prenatal care, such as monitoring frequency or interventions.

Short name

Fetal Platelet Measurement

Frequently asked questions

What causes fetal platelet counts to be tested?
Fetal platelet counts are tested primarily when there are concerns about bleeding risks, maternal health conditions affecting platelets, or during specific prenatal screenings. Your doctor may recommend it if you have a history of bleeding disorders or if complications like placental abruption or preeclampsia are suspected.
How soon after testing can I expect results?
Results are typically available within a few days to a week, depending on lab processing times. Your healthcare provider will contact you once they are ready to discuss the findings.
Can I influence the platelet count in my fetus?
While you cannot directly influence fetal platelet levels, managing your own health—such as avoiding medications that affect platelets, controlling chronic conditions like diabetes or hypertension, and following prenatal care recommendations—can help support overall fetal well-being.
  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