What are the contraindications for undergoing a DXA scan?

• A. Dental implants and previous fractures
• B. Pregnancy and certain metal implants in the scanned area
• C. Recent surgeries and obesity
• D. Age over 90 and chronic illness

Answer: (B)

The correct answer highlights that pregnancy and certain metal implants in the scanned area are significant contraindications for undergoing a DXA scan.

In terms of pregnancy, it is crucial to avoid exposing a developing fetus to ionizing radiation, which DXA utilizes. Although the radiation dose from a DXA scan is low, it is generally advised to take precautions and postpone the procedure until after childbirth.

Certain metal implants can also interfere with the accuracy of the DXA scan. If the metal is located in the area being scanned, it can create artifacts in the imaging data, potentially leading to erroneous results regarding bone density. For instance, hip or spine surgeries that involve metal plates or screws could affect the measurements taken during the scan.

Considering other options, while dental implants may be present, they are not a contraindication for DXA scans as they do not interfere with the scanning of areas relevant to bone density measurement. Recent surgeries could be relevant, but they depend on the specific circumstances rather than being absolute contraindications. Age alone does not inherently prevent someone from having a DXA scan, nor does chronic illness unless directly related to complications from the procedure.