Understand Parathyroid Hormone (PTH)

Parathyroid Hormone (PTH)

Here’s what it reflects — and what to do about it.

Longetic pulls together every lab and record you’ve had, follows how Parathyroid Hormone (PTH) changes over time, and explains what’s shifting — so you walk into your next appointment prepared, with reminders for retests along the way.

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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.

What to know about Parathyroid Hormone (PTH)

Understanding Parathyroid Hormone (PTH) means knowing what it reflects, what tends to move it, and the signs that suggest it’s worth a closer look — so you can bring the right questions to your next appointment.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Medical Disclaimer.

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.

Track your Parathyroid Hormone (PTH) over time with Longetic

Upload a lab, and Longetic reads it, explains it, and reminds you when it's time to re-check — so nothing slips between visits.