What Factors Can Affect Test Results?

Several factors can influence the results of the PTH test, including: Medications such as diuretics, lithium, or calcium supplements. Chronic kidney diseases that can disrupt calcium metabolism. Vitamin D levels and calcium intake can also affect the results.

What Do Abnormal Results Mean?

Elevated PTH levels could indicate hyperparathyroidism (overactive parathyroid glands), leading to high calcium levels (hypercalcemia). Low PTH levels might suggest hypoparathyroidism (underactive parathyroid glands) or issues like kidney disease, leading to low calcium levels (hypocalcemia).

Are There Any Risks Associated with Drawing the Blood Sample?

Blood draw procedures are generally safe. Some individuals may experience mild discomfort, pain, or bruising at the site of the needle.

What Should I Do If My Results Are Abnormal?

If the results are outside the normal range, it's essential to discuss them with a healthcare provider. Your doctor will investigate the underlying cause and recommend further tests or treatment options, depending on the severity and nature of the abnormal results.

Medical Laboratories

Parathyroid Hormone (PTH) Test

An essential test measuring PTH levels to regulate calcium and phosphate balance, protecting bone health and screening for various endocrine disorders for better metabolic stability.

Trusted medical contentUpdated: 25-04-2026Views: 60LHL-82

About this service

Parathyroid Hormone (PTH) Test is a laboratory test that measures the levels of PTH in the blood, a hormone produced by the parathyroid glands. This hormone plays a crucial role in regulating the balance of calcium and phosphate in the body. It increases calcium levels in the blood by stimulating its release from bones and enhancing its absorption from the intestines and kidneys. PTH tests are typically performed when a doctor suspects issues with calcium levels, such as hypercalcemia or hypocalcemia. Abnormal PTH levels can indicate various health conditions, including hyperparathyroidism, hypoparathyroidism, or kidney function problems. The results of this test help guide appropriate treatment and provide valuable information about the patient’s health condition.

Test purpose

Hyperparathyroidism: Elevated PTH levels can indicate hyperparathyroidism, leading to an increase in blood calcium levels (hypercalcemia).
Hypoparathyroidism: Low PTH levels may suggest hypoparathyroidism, resulting in decreased calcium levels in the blood (hypocalcemia).
Calcium Imbalance Issues: This test is often part of the evaluation for calcium levels in the blood, as PTH plays a key role in regulating these levels.
Kidney Function Problems: Abnormal PTH levels can signal issues with kidney function, as the kidneys are involved in calcium and phosphate metabolism.
Bone Health Assessment: The test provides insights into bone health, as the balance between calcium and phosphate directly affects bone strength and growth.

Recommended groups

Individuals with Calcium Imbalance: If blood calcium tests show abnormal results, whether high or low, PTH testing is recommended to understand the underlying causes.
Patients with Symptoms of Hypercalcemia: For those displaying symptoms such as fatigue, weakness, nausea, and vomiting, which may indicate an issue with calcium levels in the blood.
Individuals with Symptoms of Hypocalcemia: Symptoms like muscle cramps, tingling, or confusion may point to hypocalcemia, warranting PTH testing for further investigation.
People with Chronic Kidney Disease: Chronic kidney conditions can affect calcium and phosphate metabolism, making PTH testing important to assess kidney-related impacts on calcium balance.
Patients Diagnosed with Hyperparathyroidism: For monitoring PTH levels and evaluating the body's response to treatment in cases of overactive parathyroid glands.
Individuals with Osteoporosis: To assess bone health and the balance of minerals in the body, as calcium and phosphate are critical for bone strength.
Postmenopausal Women: Due to the increased risk of bone problems and changes in calcium levels after menopause, PTH testing can help in monitoring and managing bone health.

Indicative symptoms

Symptoms of Hypercalcemia (High Calcium Levels): Fatigue and Weakness: Persistent feelings of tiredness or lack of energy. Nausea and Vomiting: Stomach discomfort or the urge to vomit. Loss of Appetite: A lack of interest in food. Excessive Thirst: Constant sensation of being thirsty. Frequent Urination: Increased frequency of bathroom visits.
Fatigue and Weakness: Persistent feelings of tiredness or lack of energy.
Nausea and Vomiting: Stomach discomfort or the urge to vomit.
Loss of Appetite: A lack of interest in food.
Excessive Thirst: Constant sensation of being thirsty.
Frequent Urination: Increased frequency of bathroom visits.
Symptoms of Hypocalcemia (Low Calcium Levels): Muscle Cramps: Sudden and painful muscle contractions or spasms. Tingling or Numbness: A sensation of tingling or numbness, particularly in the hands and feet. Confusion or Mood Changes: Feelings of anxiety, depression, or cognitive disturbances. Difficulty Concentrating: Trouble focusing or thinking clearly.
Muscle Cramps: Sudden and painful muscle contractions or spasms.
Tingling or Numbness: A sensation of tingling or numbness, particularly in the hands and feet.
Confusion or Mood Changes: Feelings of anxiety, depression, or cognitive disturbances.
Difficulty Concentrating: Trouble focusing or thinking clearly.
Symptoms Related to Bone Health: Frequent Fractures: Broken bones occurring more easily than usual. Bone Pain: Persistent discomfort or pain in the bones.
Frequent Fractures: Broken bones occurring more easily than usual.
Bone Pain: Persistent discomfort or pain in the bones.
Personal or Family History: A family history of parathyroid disorders or kidney problems. A personal history of kidney disease or bone disorders.
A family history of parathyroid disorders or kidney problems.
A personal history of kidney disease or bone disorders.
Symptoms of Kidney Disease: Presence of chronic kidney problems such as kidney failure or other renal conditions.
Presence of chronic kidney problems such as kidney failure or other renal conditions.

Normal Levels

10 to 65 picograms per milliliter (pg/mL)
or 1.6 to 6.9 picomoles per liter (pmol/L)
Age and Gender: Normal values may vary depending on a person's age and gender.
Medications and Supplements: Medications such as diuretics, lithium, or supplements like calcium or vitamin D can affect the test results.
Overall Health Conditions: Conditions like kidney problems or other hormonal disorders may influence PTH levels.

Frequently Asked Questions

Short answers to the FAQs published with this service.

What is a PTH Test?

The Parathyroid Hormone (PTH) test is a blood test used to measure the levels of parathyroid hormone in the bloodstream. PTH plays a crucial role in regulating the body's calcium and phosphate levels.

How is the Test Done?

A blood sample is drawn in a laboratory. Typically, no special preparations are needed, although it is often recommended that the patient be fasting before the sample is taken for more accurate results.

When Should the Test Be Done?

This test is recommended when calcium levels in the blood are abnormal or when symptoms related to calcium imbalances or parathyroid gland dysfunction are present.

What Are the Normal PTH Levels?

Parathyroid Hormone (PTH) Test

About this service

Test purpose

Recommended groups

Indicative symptoms

Normal Levels

What is included?

Conditions and notices

Frequently Asked Questions

References and additional resources

Scientific references

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