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Understand Parathyroid Hormone (PTH)

Parathyroid Hormone (PTH)

Hormone markers

What the test generally measures, and what to ask about it.

Longetic keeps every lab and record you’ve had organized and easy to find, so your own Parathyroid Hormone (PTH) values sit together on one chart and you walk into your next appointment prepared.

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Updated Jul 13, 2026

What is Parathyroid Hormone (PTH)?

A hormone from the parathyroid glands in your neck that keeps blood calcium in a healthy range.

Parathyroid hormone is released by four small glands in the neck to control the level of calcium in your blood, working on your bones, kidneys and gut. Higher levels can be associated with overactive parathyroid glands or with a response to low vitamin D or kidney disease, while lower levels can be associated with underactive parathyroid glands. Because PTH and calcium move together, this test is almost always read alongside a blood calcium result.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.

References

Clinical "Parathyroid Hormone (PTH) Test" MedlinePlus (NIH/NLM). medlineplus.gov/lab-tests/parathyroid-hormone-pth-test.

About our sources

Clinical / professional

Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.

Peer-reviewed research

Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.

History of updates

Published · Jul 13, 2026
First published, written and independently fact-checked against the cited sources.

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