Skip to content

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

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

This test measures the density of minerals in your bones to check for conditions like osteoporosis or other bone-related issues.

Quick summary

["Assesses bone health and risk of fractures by comparing bone density to standard values."]

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

Key facts at a glance

LOINC
42266-7
Short code
Deprecated CT Bone Bx super need guide
Synonyms
Deprecated CT Bone Bx super need guide
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct
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

DEXA scans use low-dose X-rays to create detailed images of your bones, specifically focusing on areas like the spine, hips, and wrists. This helps determine how much calcium and other minerals are in your bones, which is crucial for identifying bone density loss over time.

Why It’s Done

Your healthcare provider may recommend a DEXA scan if you have risk factors for osteoporosis, such as being postmenopausal, having a family history of osteoporosis, or experiencing symptoms like back pain or fractures.

Preparation for the Test

No special preparation is needed. You’ll wear a hospital gown, and you’ll lie flat on a table while the scan is performed. The process takes about 10–20 minutes.

What to Expect After the Test

After the scan, you can return to your normal activities immediately. Results are typically reviewed by a radiologist or bone density specialist who will discuss findings with your doctor.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

DEXA Bone Scan

Frequently asked questions

How long does it take to get results from this test?
Results are usually available within a few days to a couple of weeks, depending on your healthcare provider’s workflow. Your doctor will explain the results in detail during a follow-up visit.
Can I eat or drink before this test?
No special diet or fasting is required. You can eat and drink normally before the test.
Is this test painful?
No, the DEXA scan is painless. You may feel a slight pressure from lying flat, but there are no injections or needles involved.
  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