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: Chest X-Ray, Single View (Diameter Assessment)

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

: A chest X-ray is a quick, painless imaging test that produces pictures of the heart, lungs, and chest wall to help evaluate breathing problems, chest pain, or suspected infection.

Quick summary

[": A chest X-ray gives your care team a fast look at the structures inside your chest to help find the cause of symptoms."]

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

Key facts at a glance

LOINC
8294-1
Short code
XR Chest Diam AP
Synonyms
XR Chest Diam AP
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 Does

: A chest X-ray uses a small amount of radiation to create a black-and-white image of the inside of your chest. It shows the lungs, heart, ribs, and the space around them so your doctor can check for problems such as fluid, infection, or an enlarged heart.

: How the Test Is Done

: You will usually stand or sit in front of a flat imaging plate and hold still for a few seconds while the machine takes the picture. You may be asked to take a deep breath and hold it. The test itself takes only a few minutes and does not hurt.

: What the "Diameter" Note Means

: The "diameter" part of this test name suggests the image is used to measure the width of a structure in the chest, such as the heart or a blood vessel. Your doctor will interpret any measurements in the context of your overall health and symptoms.

: How to Prepare

: You generally do not need special preparation for a chest X-ray. Tell the technologist if you are or may be pregnant, and remove any metal objects such as jewelry or zippers that could block the view.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

: Chest X-ray

Frequently asked questions

: Will the chest X-ray hurt?
: No. A chest X-ray is painless. You may feel a cool plate against your skin and will need to hold still briefly, but the test itself does not cause discomfort.
: How much radiation is involved?
: A chest X-ray uses a very small amount of radiation, similar to what you receive from natural background sources over a few days. Your care team follows standard safety practices to keep exposure as low as possible.
: When will I get my results?
: Results are usually available within a day or so, but timing can vary by facility. Your doctor will review the images and explain what they mean for your care.
  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