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Familial Isolated Hyperparathyroidism (FIHP) is a hereditary condition where one or more parathyroid glands become overactive and produce too much hormone. It is caused by genetic mutations that cause the parathyroid glands to enlarge and secrete excessive parathyroid hormone (PTH), leading to elevated calcium levels in the blood. The Parathyroid Hormone (PTH), Intact test is the most important test for diagnosis because it directly measures PTH levels in the blood.
Familial Isolated Hyperparathyroidism is caused by inherited genetic mutations that affect the parathyroid glands. These mutations cause one or more of the four parathyroid glands in your neck to grow larger than normal and produce too much parathyroid hormone (PTH). Unlike other forms of hyperparathyroidism that occur as part of broader genetic syndromes, FIHP affects only the parathyroid glands and runs in families, meaning multiple family members across generations may develop the condition.
The Parathyroid Hormone (PTH), Intact test is the most important test for Familial Isolated Hyperparathyroidism because it directly measures the amount of parathyroid hormone circulating in your blood. When you have FIHP, your enlarged parathyroid glands produce excessive PTH, which shows up as elevated levels on this test. This test is typically combined with blood calcium measurements to confirm the diagnosis, as high PTH levels paired with high calcium levels are the hallmark of hyperparathyroidism. If you have a family history of parathyroid problems or high calcium levels, this PTH test is essential for determining whether your parathyroid glands are overactive.
You should get tested if you have a family history of hyperparathyroidism or parathyroid disorders, especially if multiple family members have been affected. Testing is also important if you experience symptoms like kidney stones, bone pain, frequent urination, fatigue, or if routine blood work shows elevated calcium levels. Because FIHP is hereditary, doctors often recommend screening for family members of people diagnosed with the condition, even before symptoms appear, to catch it early and prevent complications.
What this means
Your PTH level is slightly elevated above the optimal range. This may indicate your parathyroid glands are working harder than normal to regulate calcium levels, which could be due to vitamin D deficiency, early kidney issues, or mild parathyroid overactivity. While this elevation is modest, it's worth investigating the underlying cause to protect your bone health long-term.
Recommended actions
Get your vitamin D levels checked, as deficiency is a common cause of elevated PTH
Ensure adequate calcium intake through dairy, leafy greens, and fortified foods
Include magnesium-rich foods like nuts, seeds, and whole grains to support calcium metabolism
Retest PTH along with calcium and vitamin D levels in 3-6 months to monitor trends
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