Why regular bone density monitoring matters
If you have been diagnosed with hyperparathyroidism, you may already know that it affects calcium levels in your blood. What many Perth patients do not realise is how significantly elevated parathyroid hormone, or PTH, can affect bone strength over time. Even when calcium levels are only mildly raised, or sometimes normal, high PTH can quietly weaken bones.
A DEXA scan is the gold standard test for measuring bone mineral density and assessing fracture risk. For patients with primary, secondary, or tertiary hyperparathyroidism, regular bone density testing is one of the most important steps in protecting long term skeletal health.
How hyperparathyroidism affects bone density
Parathyroid hormone plays a key role in regulating calcium. When PTH remains persistently elevated, it increases bone resorption, which means bone breakdown outpaces bone formation.
Hyperparathyroidism particularly affects cortical bone, the dense outer layer of bone. This means areas such as the hip and the distal 1/3 forearm are especially vulnerable. Over time, this can lead to osteopenia, osteoporosis, and an increased risk of fractures, often without obvious warning signs.
You may feel completely well, but your bones could still be losing strength. That is why a DEXA scan for hyperparathyroidism is strongly recommended at diagnosis and during follow up.
Why a DEXA scan is essential in hyperparathyroidism
1. Establishing a baseline
A bone density scan measures bone mineral density at the lumbar spine, total hip, femoral neck, and importantly for hyperparathyroidism, the distal 1/3 forearm. This provides a baseline for comparison if you are monitored conservatively, starting medical therapy, or planning parathyroid surgery.
2. Scanning the right anatomical sites
Because hyperparathyroidism preferentially affects cortical bone, including the forearm in your DEXA scan is crucial. Comprehensive site scanning improves fracture risk assessment and supports better clinical decision making.
3. Early fracture risk detection
DEXA scans detect bone loss before fractures occur. Vertebral Fracture Assessment can also identify silent spine fractures that may otherwise go unnoticed but significantly influence treatment decisions.
4. Monitoring recovery after parathyroid surgery
Following successful parathyroidectomy for primary hyperparathyroidism, many patients experience improvements in bone density within 12 to 24 months. Follow up DEXA scans allow your GP or endocrinologist to monitor recovery and determine whether additional treatment is required.
5. Supporting management in secondary hyperparathyroidism
Secondary hyperparathyroidism, often linked to chronic kidney disease or vitamin D deficiency, can affect both cortical and trabecular bone. Regular bone density testing helps guide treatment adjustments alongside management of the underlying condition.
Frequently Asked Questions
Is a DEXA scan painful?
No. A DEXA scan is quick, painless, and uses very low radiation.
Should the forearm be scanned in hyperparathyroidism?
Yes. The distal 1/3 radius is particularly important because cortical bone loss is common in this condition.
Can I have a DEXA scan if I have chronic kidney disease?
Yes. DEXA scanning is commonly used in patients with CKD to monitor bone health as part of managing secondary hyperparathyroidism.