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Chest Radiograph Diameter Measurement (Lateral View)

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

This test measures the width of your chest on a side-view X-ray to assess overall lung expansion and potential abnormalities in your thoracic cavity.

Quick summary

["Helps evaluate lung size and possible conditions affecting chest dimensions."]

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

Key facts at a glance

LOINC
38181-4
Short code
XR Chest Diam Lat
Synonyms
XR Chest Diam Lat
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr
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

A lateral chest X-ray is taken to capture a side view of your chest. The radiologist measures the distance between the most outer edges of your ribcage (thoracic diameter) to determine if it appears normal or if there may be enlargement or narrowing.

Why It’s Done

This measurement may be part of a broader evaluation for conditions like chronic obstructive pulmonary disease (COPD), kyphosis (excessive outward curvature of the spine), or other structural thoracic issues. It can also help monitor treatment progress or screen for conditions affecting lung function.

Sample Preparation

No special preparation is needed. You’ll lie on your side during the X-ray, and the technician will ensure your arms are positioned correctly to get an accurate measurement.

Common Conditions Monitored

An abnormal chest diameter could suggest conditions such as severe obesity, severe kyphosis, or advanced lung disease. A normal measurement typically indicates balanced thoracic anatomy, though individual variability exists.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Lateral Chest Diameter

Frequently asked questions

How long will I need to wait for my results?
Results are usually available within 1–3 business days, depending on your lab or radiology facility. Your healthcare provider will discuss them with you during your follow-up visit.
Is this test painful or uncomfortable?
No, this is a quick, painless procedure. You may feel a slight pressure from the X-ray machine, but no discomfort is expected.
Can I eat or drink before this test?
No dietary restrictions apply. You can eat and drink normally before the test, as it does not require fasting.
  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