Lab test
Parathyroid Hormone (PTH) Test - Lab Test
This blood test measures parathyroid hormone (PTH), a hormone released by the parathyroid glands that regulates calcium and phosphorus balance in the body.
- Typical price
- From $158
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
This blood test measures parathyroid hormone (PTH), a hormone released by the parathyroid glands that regulates calcium and phosphorus balance in the body. PTH raises blood calcium by acting on bone, the kidneys, and the gut, so its level is closely tied to calcium homeostasis. The test is ordered to help evaluate parathyroid disease and other conditions that disturb calcium, and it is usually interpreted together with a calcium measurement. Symptoms such as bone discomfort, kidney stones, or unexplained fatigue may prompt testing. Results are assessed by a healthcare provider using calcium, vitamin D, kidney function, and the clinical picture.
What this test measures
- Parathyroid Hormone (PTH) A hormone from the parathyroid glands that regulates blood calcium and phosphorus.
Who this test may be right for
- People with abnormal calcium levels
- Individuals with recurrent kidney stones
- Those with unexplained bone pain or bone loss
- People being evaluated for parathyroid gland disorders
Before your visit
- A calcium test is usually ordered at the same time; confirm with your provider
- Report vitamin D, calcium, and other supplements to the laboratory
- Follow any timing instructions provided with your order
Understanding your results
PTH is interpreted together with the calcium result, since the two are closely linked. A high PTH with high calcium may point toward overactive parathyroid glands, while a low PTH with low calcium suggests a different cause. Vitamin D deficiency and kidney function also influence the relationship. Because PTH cannot be read in isolation, a healthcare provider should interpret the findings with your calcium level and overall health.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
Why is PTH tested with calcium?
PTH and calcium regulate each other, so measuring both together shows whether the parathyroid response is appropriate for the calcium level.
What can a high PTH level suggest?
A high PTH can occur with overactive parathyroid glands or as a response to low calcium, so a healthcare provider interprets it with calcium and vitamin D.
Does vitamin D affect PTH?
Yes. Vitamin D influences calcium absorption and PTH levels, so vitamin D status is considered when PTH is evaluated.
Can kidney function affect PTH results?
Yes. The kidneys process vitamin D and calcium, so kidney function is part of how PTH results are interpreted.
What does the Parathyroid Hormone (PTH) Test - Lab Test measure?
This blood test is used to measure levels of PTH to help diagnosis parathyroid disease and other diseases that involve calcium homeostasis.
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most Parathyroid Hormone (PTH) Test - Lab Test results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
LabBookings is an independent directory. We compare test details and pricing information, but we are not a laboratory and we do not perform testing or provide medical advice. Always talk to a licensed healthcare provider about your results and treatment.
Laboratory services are provided by independent, CLIA-certified testing partners. Availability, pricing, and turnaround times can vary by location and are confirmed at checkout.