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Doppler Ultrasound — Maximum Systolic and Diastolic Blood-Flow Velocity

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

A Doppler ultrasound measurement records the highest blood-flow velocities during the heart's systolic and diastolic phases.

Quick summary

["Abnormal velocities can indicate a change in blood flow through the heart or nearby blood vessels."]

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

Key facts at a glance

LOINC
29425-6
Short code
PV-LU Vmax sys/dias DOP
Synonyms
PV-LU Vmax sys/dias DOP
Category
liver
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?

This test uses Doppler ultrasound to measure the speed of blood flow during systole, when the heart contracts, and diastole, when it relaxes. The maximum velocity, often called Vmax, is the highest speed detected at the measured location.

Why might I need this test?

A clinician may use this measurement to evaluate heart function or blood flow through a particular chamber or valve. It can also help assess conditions that affect blood moving through the cardiovascular system.

How is the test performed?

A technician applies ultrasound gel to the skin and moves a probe over the appropriate area. The probe creates images and records the direction and speed of blood flow.

How do I prepare for the test?

Doppler ultrasound usually requires no special preparation. Wear comfortable clothing, and tell the healthcare team if you have had a recent heart or vascular procedure, have a heart implant, or experience chest pain.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Doppler Vmax

Frequently asked questions

Is this the same as a standard echocardiogram?
Doppler ultrasound is commonly used during an echocardiogram or vascular ultrasound. It provides information about the speed and direction of blood flow that standard images alone may not show.
Does the test involve needles or radiation?
No. It uses sound waves and a probe placed on the skin, so it does not involve an injection or ionizing radiation.
Can I have the test if I have a heart implant?
Often, yes, but tell the healthcare team about the implant before the examination. The technician may need to adjust the Doppler settings or monitoring equipment.
  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