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Yes, the parathyroid glands directly increase calcium levels in your blood. When these four tiny glands in your neck produce too much parathyroid hormone (PTH), they trigger a condition called hyperparathyroidism, which pulls calcium from your bones into your bloodstream, leading to hypercalcemia. This guide from mylabpanel.com explains how parathyroid function affects your calcium balance, what symptoms to watch for, and which lab tests can confirm the diagnosis.
The parathyroid glands are your body's primary calcium regulators. They sense even tiny drops in blood calcium and respond by releasing PTH. This hormone acts on three main targets:
When parathyroid glands become overactive, they ignore normal feedback loops and keep pumping out PTH, forcing calcium levels above the healthy range. The result is hypercalcemia, a condition that can damage kidneys, weaken bones, and affect heart rhythm.
Today, primary hyperparathyroidism remains the leading cause of elevated calcium in outpatient settings. It usually stems from a single benign adenoma (80–85% of cases) or, less often, from hyperplasia of all four glands. Risk factors include aging (especially women over 50), radiation exposure to the neck, and certain genetic disorders like multiple endocrine neoplasia (MEN) type 1.
Not everyone with hyperparathyroidism feels sick, but chronic hypercalcemia can cause:
If you suspect your parathyroid is raising your calcium, these blood tests provide the answer:
| Test | What It Measures | Typical Result in Hyperparathyroidism |
|---|---|---|
| Serum calcium (total and ionized) | Free calcium in blood | Elevated (above 10.5 mg/dL total) |
| Intact PTH | Parathyroid hormone level | High or inappropriately normal |
| 25-hydroxy vitamin D | Vitamin D stores | Often low-normal or deficient |
| Creatinine and eGFR | Kidney function | May show reduced function |
A high calcium paired with a high or normal PTH points strongly to primary hyperparathyroidism. Doctors may also order a 24-hour urine calcium test to rule out familial hypocalciuric hypercalcemia (FHH), a benign genetic mimic.
Sometimes the parathyroid glands increase calcium production in response to an external trigger:
This occurs when chronic kidney disease or severe vitamin D deficiency lowers blood calcium, causing the parathyroids to overwork to compensate. Here, PTH is high but calcium is normal or low—not high. Treatment focuses on the underlying cause, such as vitamin D supplementation or phosphate binders.
Long-standing secondary hyperparathyroidism (common in dialysis patients) can become autonomous—the glands keep pumping PTH even after calcium normalizes, leading to high calcium. This often requires surgical removal of the overactive glands.
For primary hyperparathyroidism, the only cure is parathyroidectomy—surgical removal of the abnormal gland(s). Success rates exceed 95% when performed by an experienced surgeon. For those who cannot or choose not to have surgery, monitoring with regular calcium and bone density checks is an option, along with medications like cinacalcet (to lower PTH) or bisphosphonates (to protect bones).
With the aging US population, hyperparathyroidism diagnoses are rising. Early detection through simple blood work can prevent complications like osteoporosis, kidney failure, and cardiovascular strain. mylabpanel.com offers convenient, at-home lab test kits that measure your calcium, PTH, and vitamin D levels so you can take control of your health without a doctor visit.
Ready to check if your parathyroid is affecting your calcium? Order the mylabpanel.com Parathyroid Health Panel today and get fast, CLIA-certified results delivered directly to your secure online account.
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Find a Lab Near MeYes, the parathyroid glands produce parathyroid hormone (PTH), which raises blood calcium by pulling it from bones, reducing kidney excretion, and increasing intestinal absorption. Overactive glands cause hypercalcemia.
Symptoms include fatigue, bone pain, kidney stones, frequent urination, digestive issues, depression, and brain fog. Many people have no symptoms initially.
Blood tests for serum calcium, intact PTH, vitamin D, and kidney function are standard. A 24-hour urine calcium test helps rule out other conditions.
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