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Inferior Vena Cava End-Diastolic Diameter Measurement by 2D Ultrasound

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

This test measures the size of your inferior vena cava (IVC) at its narrowest point during the end of your heartbeat cycle, using ultrasound. It helps assess blood flow and potential issues with blood pooling or pressure in your veins.

Quick summary

["This test helps evaluate your heart’s ability to pump blood efficiently and check for conditions like deep vein thrombosis or abnormal blood flow."]

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

Key facts at a glance

LOINC
79967-6
Short code
IVC End exp diameter 2D US
Synonyms
IVC End exp diameter 2D US
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-d
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 This Test Is Done

Your healthcare provider may order this test if you have symptoms like swelling in your legs, shortness of breath, or if they suspect conditions like deep vein thrombosis, heart failure, or other circulatory issues. It’s also used in certain pre-operative evaluations or during pregnancy to monitor blood flow.

How the Test Works

You’ll lie down on an exam table while an ultrasound probe is placed on your abdomen or chest. The probe sends sound waves to create images of your IVC. The technician measures its diameter at its narrowest point during the end of your heartbeat cycle, typically when your heart relaxes.

Preparation

No special preparation is needed, but you may be asked to drink water beforehand to help the ultrasound images appear clearer. Wear comfortable clothing that allows easy access to your abdomen or chest.

What to Expect During the Test

The test usually takes about 15 to 30 minutes. You may feel a slight pressure or warmth where the probe is placed, but it shouldn’t be painful. You’ll be able to talk to the technician throughout the procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IVC End-Diastolic Diameter (2D Echocardiogram)

Frequently asked questions

What Does a Low or High IVC Diameter Mean?
A very small IVC diameter (typically less than 2 cm) may suggest dehydration, high blood pressure, or certain heart conditions. A larger diameter (greater than 2.5 cm) could indicate conditions like heart failure, pregnancy, or low blood pressure. However, these measurements are relative and depend on individual health factors, so results are interpreted by a healthcare provider in context.
How Often Will I Need This Test?
The frequency depends on your medical condition and treatment plan. Your healthcare provider will determine how often you need follow-up tests based on your symptoms and test results.
Can I Eat or Drink Before the Test?
You can eat and drink normally before the test unless instructed otherwise by your provider. Drinking water beforehand may help improve image clarity, but avoid alcohol or caffeine if your provider recommends it.
  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