Parathyroid Hormone (PTH) — What It Means in Your Blood Test
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This hormone keeps the calcium in your blood at a steady, healthy level.
A Parathyroid Hormone (PTH) reading shows how much of this messenger is working to hold your blood calcium steady. Doctors nearly always read it side by side with your calcium result.
Also known as: PTH, Intact PTH, iPTH, Parathormone, Parathyrin
This isn't a case where higher or lower is better. Your body keeps it in a narrow band, and both directions can matter.
Last reviewed: 2026-08-16
What is Parathyroid Hormone (PTH)?
PTH comes from the parathyroid glands in your neck. It raises blood calcium by acting on bone and kidneys, and indirectly on the gut.
Why is Parathyroid Hormone (PTH) tested?
You may have this test, usually with calcium, to check your calcium and phosphate balance. It also checks how the parathyroid glands work.
What is a normal Parathyroid Hormone (PTH) range?
- India
- No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison.
- Global
- Intact PTH (adults): 15–65 pg/mL (reference ranges vary by laboratory and assay generation)
Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
Source: [Endocrine Society, 2022]
What does your Parathyroid Hormone (PTH) value mean?
There is no widely-accepted set of value bands for this parameter. Compare your result with the reference range printed on your own report, and discuss it with your doctor.
What does a high Parathyroid Hormone (PTH) result mean?
A high result can link to overactive parathyroid glands, low vitamin D, or long-term kidney disease. Your doctor can help interpret it with your calcium.
What does a low Parathyroid Hormone (PTH) result mean?
A low result with high calcium can mean the body senses enough calcium. A low result with low calcium can point to underactive glands. This is worth discussing with your doctor.
What can affect your Parathyroid Hormone (PTH) result?
- Blood calcium level (low calcium raises PTH)
- Vitamin D status
- Kidney function
- Magnesium levels
- Time of day (mild daily variation)
Questions to ask your doctor
About this result
- What does my Parathyroid Hormone (PTH) result mean for me specifically, given my age and health?
- Is my Parathyroid Hormone (PTH) in the range that is right for me, not just the lab's general range?
What to do next
- Could anything I eat, do, or take have affected my Calcium-regulating hormone level result?
- Is there anything I should do about my Parathyroid Hormone (PTH), or is it fine to leave as it is?
About retesting
- Does my Parathyroid Hormone (PTH) need to be repeated, and if so, when?
- The typical range for Parathyroid Hormone (PTH) can vary between labs — should I compare my result against my own lab's printed range?
The bigger picture
- Should my Parathyroid Hormone (PTH) be looked at together with my Total Testosterone and Free Testosterone result?
- Does my Parathyroid Hormone (PTH) connect to any condition I already have, or to anything I have noticed in how I feel?
Frequently asked questions
- What is Parathyroid Hormone (PTH)?
- PTH comes from the parathyroid glands in your neck. It raises blood calcium by acting on bone and kidneys, and indirectly on the gut. You may have this test, usually with calcium, to check your calcium and phosphate balance. It also checks how the parathyroid glands work.
- What is a normal Calcium-regulating hormone level range?
- A typical adult range is around Intact PTH (adults): 15–65 pg/mL (reference ranges vary by laboratory and assay generation). No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
- What does a high Parathyroid Hormone (PTH) result mean?
- A high result can link to overactive parathyroid glands, low vitamin D, or long-term kidney disease. Your doctor can help interpret it with your calcium.
- What does a low Parathyroid Hormone (PTH) result mean?
- A low result with high calcium can mean the body senses enough calcium. A low result with low calcium can point to underactive glands. This is worth discussing with your doctor.
- What can affect your Parathyroid Hormone (PTH) result?
- Several everyday factors can influence it, including Blood calcium level (low calcium raises PTH), Vitamin D status, Kidney function, Magnesium levels, Time of day (mild daily variation).
Sources
- Endocrine Society (2022) — Guidelines for the Management of Asymptomatic Primary Hyperparathyroidism
- AACE (2016) — AACE/ACE Disease State Clinical Review on Hyperparathyroidism
Part of the Hormones
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