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Transverse Diameter of the Erectile Tissue (Penile)

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

This test measures the width of the erectile tissue in the penis during an evaluation for erectile dysfunction or related conditions.

Quick summary

["Understanding your penile anatomy may help with diagnosing or managing erectile health."]

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

Key facts at a glance

LOINC
53655-7
Short code
Fet Hrt Diam transverse US.meas
Synonyms
Fet Hrt Diam transverse US.meas
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-measured
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 This Test Measures

The test evaluates the transverse diameter of the erectile tissue, which is the width of the penis when it is partially or fully erect. This measurement is often taken during an ultrasound or other imaging study to assess blood flow and tissue structure.

Why It’s Done

Doctors may order this test to diagnose erectile dysfunction, evaluate penile trauma, assess vascular conditions, or guide treatment decisions for conditions like Peyronie’s disease or other penile abnormalities.

How It’s Performed

This test typically involves an ultrasound, where a small probe is placed on the penis to capture images of the erectile tissue. You may be asked to achieve and maintain an erection for accurate measurements.

Preparation

No special preparation is needed, but you may be asked to avoid certain medications (like nitrates) that could affect your erection before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal measurements may indicate poor blood flow, structural issues, or underlying health conditions affecting erectile function. Changes in diameter can also help monitor treatment progress for conditions like diabetes or hypertension.

Frequently asked questions

Will I feel pain or discomfort?
Most patients describe minimal discomfort during the ultrasound, though some may feel slight pressure. If you have a sensitive area, let your healthcare provider know.
How long will the test take?
The procedure usually takes about 15–30 minutes, including preparation and follow-up discussion.
Can I drive after the test?
Yes, you can typically drive afterward unless you were given medication that affects alertness during the procedure.
  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