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Parathyroid Hormone (PTH)

Published: July 27, 2026Updated: August 25, 2026

Parathyroid Hormone (PTH) is a hormone produced by the parathyroid glands that regulates calcium and phosphate levels in the blood.

Quick summary

PTH is a key hormone for calcium homeostasis and bone metabolism.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
pg/mL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche PTH, Abbott PTH, Siemens PTH, Beckman PTH
interpretation: {"text":"May indicate hypoparathyroidism or high calcium levels due to other conditions.","label":"Low PTH"}; {"text":"Suggests hyperparathyroidism or a response to low calcium levels.","label":"High PTH"}

Parathyroid Hormone (PTH) is essential for maintaining calcium balance in the body. It acts on bones, kidneys, and intestines to increase calcium levels in the blood.

In the context of bone health, elevated PTH levels can lead to increased bone resorption, which may result in conditions like osteoporosis.

The diagnostic utility of PTH measurement is crucial for evaluating disorders of calcium metabolism, including hyperparathyroidism and hypoparathyroidism.

Frequently asked questions

What is the normal range for PTH?
The normal range for PTH is typically between 15–65 pg/mL.
How is PTH testing used in clinical practice?
PTH testing is used to diagnose and manage disorders of calcium metabolism, such as hyperparathyroidism and hypoparathyroidism.
  1. 1
    Parathyroid Hormone (PTH) TestSource
  2. 2
    Role of PTH in Calcium HomeostasisSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy