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Radiographic evaluation of sacrum and coccyx with anteroposterior and lateral views

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

This test involves taking X-ray images of the sacrum (the triangular bone at the base of the spine) and coccyx (the small tailbone) to assess bone structure, alignment, or potential abnormalities.

Quick summary

["X-rays help diagnose issues like fractures, infections, or degenerative changes in these bones."]

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

Key facts at a glance

LOINC
24665-2
Short code
XR Sacrum+Coccyx Views
Synonyms
XR Sacrum+Coccyx Views
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

Why This Test Is Done

Your doctor may order this test if you have symptoms like back pain, trauma, or signs of bone problems. It’s also used to check for conditions like osteoporosis, infections, or congenital abnormalities in the sacrum or coccyx.

What to Expect Before the Test

No special preparation is needed. You’ll likely wear a gown, and the technician will position you on an X-ray table. A lead apron will be placed over your abdomen to protect you from radiation.

What Happens During the Test

The technician will take two X-ray images: one from the front (anteroposterior view) and one from the side (lateral view). Each image captures different angles to provide a full view of the sacrum and coccyx.

What to Expect After the Test

You can return to your normal activities immediately. If you have any discomfort or notice unusual symptoms, contact your healthcare provider. Your X-ray images will be reviewed by a radiologist.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Sacrum/Coccyx X-ray (AP & Lat)

Frequently asked questions

How long does it take to get the results?
Results are typically available within 24–72 hours, depending on your healthcare provider’s workflow. Your doctor will discuss findings with you during a follow-up visit.
What does an abnormal X-ray mean?
An abnormal X-ray may show misalignments, bone damage, or signs of conditions like osteoporosis or infections. Your doctor will explain the specific findings and next steps based on your symptoms.
Do I need to fast or avoid certain foods before this test?
No fasting or dietary restrictions apply. This is a non-invasive imaging test with no dietary impact.
  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