Lab marker · High

High Parathyroid Hormone (PTH): what it means

A Parathyroid Hormone (PTH) result above the normal range is considered high. Here is what a raised Parathyroid Hormone (PTH) can point to, and when it is worth discussing with a doctor.

Reference range: 15–65 pg/mL (intact PTH assay)

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What a high Parathyroid Hormone (PTH) can mean

  • Primary hyperparathyroidism — solitary parathyroid adenoma (~85%) or hyperplasia; high calcium, low/normal phosphate, mildly elevated PTH.
  • Secondary hyperparathyroidism (vitamin-D deficient) — body raises PTH to maintain calcium when D is low; low/normal calcium, low vitamin D.
  • Secondary hyperparathyroidism (CKD) — kidney can't activate vitamin D or excrete phosphate; high phosphate, low calcium, PTH can be very high.
  • Tertiary hyperparathyroidism — autonomous gland overgrowth after long-standing CKD on dialysis.
  • Lithium therapy — alters calcium-sensing receptor; chronic users.

When to discuss with a doctor

Persistent calcium >10.5 mg/dL or symptoms of kidney stones, bone pain, abdominal pain, fatigue or depression warrant PTH + 25-OH vitamin D + 24-hour urine calcium. Primary hyperparathyroidism with classical symptoms is a surgical referral. Mediora.AI shows PTH alongside calcium and vitamin D; treatment decisions belong with endocrinology.

Conditions this can relate to

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.