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Mandibular Bone Mineral Density (by Dual-Energy X-ray Absorptiometry, DEXA)

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

This test measures the density of your jawbone to assess bone health and identify potential osteoporosis or other bone-related conditions.

Quick summary

["A bone density test helps check if your jawbone is losing mass or weakening over time."]

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

Key facts at a glance

LOINC
48745-4
Short code
Deprecated Mandible-L XR
Synonyms
Deprecated Mandible-L XR
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 healthcare provider may recommend this test if you have symptoms of bone loss, such as jaw pain, fractures, or if you’re at higher risk for osteoporosis due to factors like age, gender, or certain medical conditions. It’s also used to monitor treatment effectiveness for conditions affecting bone density.

What to Expect Before the Test

You’ll typically lie on a table while a device scans your jaw using low-dose X-rays. The process takes about 10–15 minutes and is painless. No special preparation is needed, but inform your provider if you have metal implants or other medical devices in your jaw.

During the Test

The test involves two X-ray scans of your lower jaw (mandible) to measure bone density. The results help determine if your bone mass is normal, low, or at risk for fractures.

After the Test

You can resume normal activities immediately. Results are usually ready within a few days and will be reviewed by your healthcare provider to guide further care.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Mandible DXA

Frequently asked questions

What does a low or high bone density result mean?
A low bone density result suggests your jawbone may be weaker than average, which could raise concerns about osteoporosis or other bone-related issues. A high result may indicate stronger bone density than expected, but further evaluation is needed to rule out other factors.
How often should I get this test?
Your healthcare provider will determine how often you need this test based on your risk factors, medical history, and overall health. Typically, follow-up tests are recommended every 2–5 years for those at moderate risk or annually for higher-risk individuals.
Can I eat or drink before the test?
No special diet or fasting is required before this test. However, inform your provider if you’ve recently had dental work or if you’re taking medications that affect bone density.
  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