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Right Ventricular Major Axis Diameter, Apical Four-Chamber Echocardiographic Measurement

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

An ultrasound measurement of the right ventricle’s main long-axis size, taken in the apical four-chamber view.

Quick summary

["This echocardiogram measurement helps assess right ventricular size and function in combination with other heart ultrasound findings."]

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

Key facts at a glance

LOINC
93643-5
Short code
RV Major axis dias A4C
Synonyms
RV Major axis dias A4C
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-d-a-c
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 is a measurement obtained during an echocardiogram, or heart ultrasound. It measures the right ventricle along its major axis in the apical four-chamber view, which shows both sides of the heart.

Why might I need this test?

The measurement may be used to evaluate right ventricular size and function. It can help investigate symptoms such as shortness of breath, fatigue, swelling, or reduced exercise tolerance, or monitor known heart conditions.

How is the test performed?

A technician or clinician moves an ultrasound probe over the chest to create images of the heart. The right ventricle is then measured in a standard four-chamber view.

How do I prepare for the test?

An echocardiogram usually requires no special preparation. Wear comfortable clothing, and tell the clinician if you have chest pain, breathing problems, or a history of heart disease.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A larger right ventricular diameter may indicate enlargement or strain of the right side of the heart, which can occur with elevated heart pressures, pulmonary disease, or volume overload. A smaller measurement may reflect reduced filling or lower blood volume. Results should be interpreted with the other echocardiographic measurements and your clinical history.

Short name

Right Ventricular Diameter by Echo

Frequently asked questions

Does this test require radiation or a blood sample?
No. It is an ultrasound-based measurement performed during an echocardiogram and does not use radiation or require a blood sample.
What does the apical four-chamber view show?
It is a standard heart ultrasound view showing all four chambers: the left and right atria above and the left and right ventricles below.
Can this measurement diagnose a heart condition by itself?
No. It is one part of an echocardiogram and must be interpreted alongside the heart’s pumping function, motion, valves, pressures, and other findings.
  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