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Maximum Doppler Flow Velocity in Blood Flow

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

This test measures the highest speed of blood flow detected using Doppler ultrasound, often evaluated in vascular studies to assess blood vessel function.

Quick summary

["Helps identify blood flow restrictions or abnormal circulation patterns in vessels."]

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

Key facts at a glance

LOINC
20355-4
Short code
Bld flow 2.max DOP
Synonyms
Bld flow 2.max 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 Used For?

Doctors may use this test to evaluate blood flow in arteries or veins, particularly in conditions like peripheral artery disease, carotid artery stenosis, or before vascular procedures. It can also help assess blood flow in the brain or other organs when needed.

How Is This Test Performed?

A Doppler ultrasound probe is placed on your skin over the area of interest (e.g., neck, legs, or head). The probe emits sound waves that bounce off blood cells, creating a signal that measures flow speed and direction. No preparation is typically required, but you may need to lie still for a few minutes.

Common Conditions Monitored

This test is often used to diagnose or monitor vascular issues such as narrowing of blood vessels, poor circulation, or blood flow problems in the brain. It may also be part of a broader evaluation for symptoms like leg pain, headaches, or dizziness linked to circulation.

What Does the Results Mean?

Results are compared to expected values for your age, health, and specific vascular anatomy. Abnormally high or low flow velocities may indicate blockages, inflammation, or other vascular concerns. Your doctor will interpret results in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Why might I need this test?
Your doctor may recommend this test if you have symptoms like leg pain, cold hands/feet, headaches, or dizziness that could relate to poor circulation. It’s also used before surgeries or procedures involving blood vessels to assess risks.
What preparation is needed before the test?
No special preparation is usually required, but you may be asked to fast for 4 hours if the test involves fasting (e.g., for glucose-related studies). Wear loose clothing and avoid lotions or oils on the skin where the probe will be placed.
Are there any risks or side effects?
Most people tolerate this test well. Rarely, you might feel discomfort from the probe pressure or mild bruising at the site. Avoid eating or drinking for 4 hours before the test if instructed, as it may affect results.
  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