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Fetal Maternal Plasma Waveform Doppler Velocity (Peak Systolic/Awake Velocity)

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

This test measures the speed of blood flow in fetal blood vessels during awake periods, often used in prenatal care to assess fetal well-being.

Quick summary

["Helps monitor fetal circulation and detect potential issues early during pregnancy."]

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

Key facts at a glance

LOINC
11641-8
Short code
Fet MV Peak A-wave DOP
Synonyms
Fet MV Peak A-wave DOP
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-doppler
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

What Is This Test Measuring?

The test evaluates the peak systolic and diastolic blood flow velocities in fetal arteries or veins using Doppler ultrasound. It measures how fast blood moves through these vessels when the fetus is awake, providing insights into vascular resistance and perfusion. This is typically done via a maternal blood sample collected during pregnancy.

Why Might This Test Be Ordered?

A healthcare provider may recommend this test if there are concerns about fetal growth restrictions, placental insufficiency, or other conditions that could affect blood flow. It can also be part of routine prenatal monitoring in high-risk pregnancies.

How Is the Sample Collected?

A blood sample is drawn from your arm, similar to other blood tests. The sample is then processed to separate fetal plasma from maternal components. The fetal plasma is analyzed for blood flow velocity waveforms using Doppler ultrasound technology.

What Does the Result Mean?

Results are interpreted by a healthcare professional based on the waveform patterns and velocities observed. Abnormal findings may indicate potential issues that require further evaluation, such as reduced fetal oxygenation or placental dysfunction.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fetal Doppler Waveform Peak Velocity

Frequently asked questions

How often is this test performed during pregnancy?
This specific fetal Doppler waveform test is not a routine blood test but is typically performed during ultrasound evaluations when fetal blood flow is being assessed, often in later pregnancy (typically after 24 weeks). It depends on clinical indications, such as high-risk pregnancies or specific symptoms.
What are the possible risks or side effects of this test?
The blood draw itself carries minor risks like bruising or slight discomfort at the injection site. There are no direct risks associated with the fetal Doppler waveform analysis itself, but any ultrasound procedure may involve minimal exposure to sound waves, which are considered safe for pregnancy.
Can I fast before this test?
No fasting is required for this test, as it involves a simple blood draw. However, always follow your healthcare provider’s instructions regarding any medications or supplements you should avoid before the procedure.
  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