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Coccygeal Bone Mineral Density (Bone Density of the Coccyx)

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

This test measures the mineral content of your coccyx (tailbone) to assess bone health and identify potential issues like osteoporosis or metabolic bone diseases.

Quick summary

["Assessing your coccyx bone strength helps prevent fractures and understand underlying bone conditions."]

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

Key facts at a glance

LOINC
103509-6
Short code
XR port Sacrum+Coccyx 1V
Synonyms
XR port Sacrum+Coccyx 1V
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-portable
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

Doctors may order this test if you have symptoms like back pain, a history of bone diseases (such as osteoporosis), or if you’re at risk for fractures. It can also be part of a broader evaluation for metabolic bone disorders or after trauma.

How the Test Works

Bone density is measured using a specialized imaging technique that evaluates the mineral density of your coccyx. This is typically done with a dual-energy X-ray absorptiometry (DXA) scan, which is safe and non-invasive.

Sample Collection and Preparation

This test does not require a blood, urine, or other bodily fluid sample. Instead, it involves a quick imaging scan of your lower spine, including the coccyx, during a routine visit to the clinic or hospital.

What to Expect During the Test

You’ll lie down on a table while the technician positions your lower spine under the imaging machine. The scan takes only a few minutes, and you may hear a faint clicking sound as the machine captures images.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Coccyx Bone Density

Frequently asked questions

Bone density of the coccyx can indicate overall bone health and help diagnose conditions like osteoporosis, which weakens bones and increases fracture risk. Low density may also suggest metabolic bone diseases or long-term conditions affecting bone strength.
This test may not provide direct insights into coccyx-specific injuries (like fractures) but helps assess systemic bone health, which can influence pain or instability in the tailbone area.
Is this test painful?
No, the imaging scan is painless and involves only a brief positioning on a table. You may feel slight pressure during the scan, but discomfort is minimal.
How long does it take to get results?
Results are usually available within a few days to a week after the scan, depending on your healthcare provider’s workflow. Your doctor will discuss them during your follow-up visit.
  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