Which test might indicate bone metastases if the results show abnormalities?

• A. Serum calcium level
• B. Liver function tests
• C. Chest X-ray
• D. CT scan of the brain

Answer: (A)

Bone metastases can occur when cancer cells spread from a primary tumor to the bones, which can significantly impact the patient's health. Abnormal results in serum calcium levels can indicate such metastases because cancer in the bones often leads to a release of calcium into the bloodstream, causing hypercalcemia. Elevated serum calcium levels may suggest that the bones are being affected by cancer, especially in cases such as breast cancer, prostate cancer, or lung cancer, which are known for frequently metastasizing to bones.

While liver function tests, a chest X-ray, and a CT scan of the brain are valuable diagnostic tools, they are not specifically indicative of bone metastases. Liver function tests are primarily used to assess liver health and disease, chest X-rays are more suited for examining lung conditions and other thoracic issues, and a CT scan of the brain focuses on detecting abnormalities within the brain itself. Therefore, serum calcium levels are the most direct indicator among the provided options that suggest bone involvement with metastatic disease.