Understanding Parathyroid Hormone (PTH) Levels and Their Significance
Learn about the normal range for Parathyroid Hormone (PTH) and what these levels mean for your health.
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is below the typical adult range (15–65 pg/mL).
is within the typical adult range (15–65 pg/mL).
is above the typical adult range (15–65 pg/mL).
This number is very far from the usual range - check which unit your report uses.
A value this far outside the range is worth discussing with your doctor today.
What a low result usually means
What a high result usually means
The range printed on your own report comes first - it differs between laboratories. This is not a diagnosis.
See it next to the rest of your report - upload it for a free, private explanationFree. Sign up with your email - no password, we send you a code.Parathyroid Hormone (PTH) is a crucial hormone produced by the parathyroid glands, located in your neck. It plays a vital role in regulating calcium levels in the blood, which is essential for bone health, nerve function, and muscle function. Understanding the normal reference range for PTH can help you interpret your lab results and understand your overall health.
What is Parathyroid Hormone (PTH)?
Parathyroid Hormone (PTH) is a hormone secreted by the parathyroid glands. Its primary function is to regulate calcium levels in the blood. When calcium levels are low, PTH is released to increase calcium by stimulating the release of calcium from bones, increasing calcium absorption in the intestines, and reducing calcium loss in the urine.
Normal PTH Reference Range
The typical adult reference range for PTH, measured using an intact PTH assay, is 15–65 pg/mL. This range is considered normal for adults, and values within this range suggest that your parathyroid glands are functioning properly.
Why PTH Levels Matter
PTH levels are important because they reflect how well your body is managing calcium levels. Abnormal PTH levels can indicate various health conditions. High PTH levels may suggest hyperparathyroidism, a condition where the parathyroid glands produce too much hormone, often leading to elevated calcium levels. Conversely, low PTH levels can be a sign of hypoparathyroidism, where the glands produce too little hormone, potentially causing low calcium levels.
Factors Affecting PTH Levels
Several factors can influence PTH levels, including vitamin D levels, kidney function, and certain medications. Vitamin D is necessary for calcium absorption, and low levels can cause the parathyroid glands to release more PTH. Kidney function is also crucial because the kidneys help convert vitamin D into its active form and excrete excess phosphate, both of which are important for calcium balance.
Frequently asked questions
What does it mean if my PTH level is above 65 pg/mL?
A PTH level above 65 pg/mL may indicate hyperparathyroidism or other conditions affecting calcium regulation. It is essential to consult with your healthcare provider for further evaluation.
Can medications affect my PTH levels?
Yes, certain medications, such as lithium or diuretics, can influence PTH levels. Always inform your healthcare provider about any medications you are taking.
How is PTH tested?
PTH is tested through a blood sample, typically taken from a vein in your arm. The test measures the level of intact PTH in your bloodstream.
When to see a doctor
You should see a doctor if your PTH levels are outside the normal range of 15–65 pg/mL, as this could indicate an underlying health issue. Additionally, if you experience symptoms like muscle cramps, fatigue, or unusual bone pain, it is advisable to consult a healthcare professional.
Decisions about your health should always be made in consultation with your healthcare provider.