BMD/DEXA and Body Composition DEXA: Preparation, Pregnancy, Limits, and Support Persons

Overview

BMD stands for Bone Mineral Density. A BMD or DEXA scan is commonly used to measure bone density.

A DEXA Total Body Composition scan uses similar low-dose X-ray technology to assess fat mass, lean mass, and bone mineral content. The scan itself is usually quick and may take about 6–10 minutes, depending on the exam.

What You Need to Know

• BMD and DEXA scans use low-dose X-ray technology.
• Do not attend a BMD appointment if you are pregnant or might be pregnant.
• If there is any chance you may be pregnant, take a home pregnancy test before your appointment.
• Support people cannot stay in the room during the scan because the test uses ionizing radiation.
• You usually do not need to change into a gown for a standard BMD scan.
• Wear comfortable clothing without metal.
• Avoid clothing with zippers, snaps, belts, metal buttons, or metal accessories.
• The maximum weight limit is 350 lb.
• The maximum height limit is 6'4".
• Recent barium, contrast, or radioisotope procedures may interfere with some DEXA scans.

Before You Book

Confirm which type of exam you are having:

• Standard BMD / bone density scan
• DEXA Total Body Composition scan

Let the clinic know before your appointment if:

• You are pregnant or might be pregnant
• You recently had a barium, contrast, or radioisotope procedure
• You are close to the height or weight limit
• You need accessibility or transfer support
• You are unsure whether your scan is OHIP-covered or private pay

How to Prepare

Patient Prep (BMD)

For most BMD scans:

• Wear comfortable clothing.
• Avoid metal on or near the area being scanned.
• Do not wear clothing with zippers, snaps, belts, or metal accessories if possible.
• Bring your requisition if one is required.
• Bring your health card, if applicable.

For DEXA Total Body Composition:

• Wear clothing without metal.
• Avoid strenuous exercise before the scan.
• Do not attend if you are pregnant.
• Tell the clinic if you recently had barium, contrast, or radioisotope imaging.

Safety Notes

BMD and DEXA scans use ionizing radiation. The dose is low, but pregnancy is an important safety consideration.

If you are pregnant or think you could be pregnant, do not proceed with the test unless you have been specifically advised by your healthcare provider. If there is any chance of pregnancy, take a home pregnancy test before the appointment.

Support people cannot stay in the scan room during the exam because only qualified staff may remain in the room while imaging is being performed.

When to Contact GNMI

Contact GNMI before your appointment if:

• You are pregnant or might be pregnant
• You recently had a barium, contrast, or radioisotope procedure
• You are unsure whether your clothing is appropriate
• You are concerned about the height or weight limits
• You need accessibility or transfer support
• You are unsure whether you are booked for BMD or DEXA Total Body Composition
• You need to confirm whether the exam is OHIP-covered or private pay