Parathyroid Hormone (PTH) Test
The Parathyroid Hormone (PTH) test is a blood test used to measure the level of parathyroid hormone in the blood. PTH is a hormone produced by the parathyroid glands, which are four small glands located near the thyroid gland in the neck.
Purpose of the Test
The PTH test is used to:
- Diagnose and monitor hyperparathyroidism, a condition where the parathyroid glands produce too much PTH
- Diagnose and monitor hypoparathyroidism, a condition where the parathyroid glands do not produce enough PTH
- Evaluate the function of the parathyroid glands in patients with kidney disease or vitamin D deficiency
- Monitor the effectiveness of treatment for hyperparathyroidism or hypoparathyroidism
How the Test is Performed
The PTH test is a simple blood test that requires:
- A healthcare professional to draw a blood sample from a vein in the arm
- The blood sample to be sent to a laboratory for analysis
- The laboratory to measure the level of PTH in the blood using a specialized test
Preparation for the Test
No special preparation is required for the PTH test. However, patients may be asked to:
- Fast for a certain period before the test
- Avoid taking certain medications that can affect the test results
- Inform their healthcare provider about any medications they are taking
Understanding Test Results
The normal range for PTH levels in the blood is typically between 10-65 pg/mL. However, the normal range may vary depending on the laboratory and the individual's age, sex, and medical condition.
- High PTH levels may indicate hyperparathyroidism or other conditions such as kidney disease or vitamin D deficiency
- Low PTH levels may indicate hypoparathyroidism or other conditions such as magnesium deficiency or certain medications
Risks and Limitations of the Test
The PTH test is a relatively safe and simple procedure. However, as with any blood test, there is a small risk of:
- Bleeding or bruising at the needle site
- Infection at the needle site
- Dizziness or lightheadedness after the test
The PTH test may not be accurate in certain situations, such as:
- Pregnancy or lactation
- Certain medical conditions, such as kidney disease or liver disease
- Use of certain medications that can affect the test results
Article last updated on: 15th June 2025.
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