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Maximum Systolic and Diastolic Blood Flow Velocity by Doppler Ultrasound

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

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

Quick summary

["This test uses sound waves to measure blood-flow speed and help evaluate narrowing, leakage, or obstruction."]

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

Key facts at a glance

LOINC
29457-9
Short code
PV-LU Vmax sys/dias DOP.der
Synonyms
PV-LU Vmax sys/dias DOP.der
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-derived
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 maximum speed of blood flow during systole, when the heart contracts, and diastole, when it relaxes. The exact blood vessel or heart valve measured is identified by the imaging order and report.

Why might I need this test?

It may be ordered to evaluate blood flow through a blood vessel or heart valve. Clinicians use it to help investigate narrowing, obstruction, inadequate circulation, or blood flowing in the wrong direction.

How is the test performed?

A technician places an ultrasound probe over the area being examined, usually with gel on the skin. The machine uses returning sound waves to create images and calculate maximum systolic and diastolic flow velocities. It is painless and does not use ionizing radiation.

How do I prepare for the test?

Fasting or medication changes are generally not required, but preparation can vary by the vessel or valve being examined. Wear comfortable clothing, follow the center's instructions, and tell the technologist if you have recently had surgery or an injury in the area.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal flow velocities may indicate narrowing, obstruction, or backward flow through a valve or vessel. Reduced flow can also occur when blood volume or overall circulation is low. Results should be interpreted with the examination findings, symptoms, and other Doppler measurements because normal values vary by the site measured.

Short name

Doppler blood-flow velocity

Frequently asked questions

Is this the same as a standard ultrasound?
It uses the same ultrasound equipment but also measures the speed and direction of blood flow.
Does the test involve radiation?
No. Doppler ultrasound uses sound waves and does not expose you to ionizing radiation.
Will I feel pain during the test?
Usually not. You may feel gentle pressure from the probe, especially if the probe is placed on the lower abdomen or groin.
  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