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Parathyroid Hormone (PTH) Blood Test Plus Calcium

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The Parathyroid Hormone (PTH) Blood Test Plus Calcium measures the PTH and calcium levels in the blood to help screen for, diagnose, and monitor various health conditions


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Test Code:


CPT Code(s):

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Also Known As:

PTH, Intact and Calcium


See Individual Tests




Fasting for at least 12-14 hours prior to collection is required. Patients should stop biotin consumption at least 72 hours prior to the collection.

Test Results:

2-4 days. May take longer based on weather, holiday, or lab delays.

Walk-In Lab is prohibited from selling LabCorp tests to residents in the following states:NY, NJ, RI, MA, MD

How are PTH and calcium related?

Parathyroid hormone (PTH) is produced by the parathyroid glands, four small glands in the neck. The parathyroid hormone regulates the level of calcium in the blood and bones and helps control phosphorus and vitamin D levels. The parathyroid glands are triggered to produce more PTH when calcium levels are low. PTH transmits chemical messages to other organs to ensure calcium levels are balanced. 


Examples of PTH communicating with other organs regarding calcium levels include:


  • PTH signals the bones to discharge some of their calcium into the blood.
  • PTH tells the digestive system to absorb more calcium from an individual's food.
  • PTH instructs the kidneys to reserve calcium in the body rather than dispelling it in the urine.


Following the release of PTH from the parathyroid glands, the hormone is operative in the body for only a few minutes. Therefore, the parathyroid glands stop releasing PTH when blood calcium levels rise. However, some individuals may have a condition that causes the parathyroid glands to malfunction, producing either too much PTH or too little. An individual's excess or deficiency of the parathyroid hormone can result in abnormal blood calcium levels that may lead to serious health problems.


What is the purpose of this test?

Order this Parathyroid Hormone (PTH) Blood Test Plus Calcium to measure the PTH and calcium levels in the blood and help screen for, diagnose, and monitor various health conditions. 


Individuals may use this PTH Blood Test Plus Calcium to help with the following:


  • Diagnosing the cause of abnormal calcium levels, phosphorous deficiency, and severe osteoporosis.
  • Monitoring patients undergoing treatment for kidney disease, hyperparathyroidism, and hypoparathyroidism.
  • Confirming the successful removal of overactive parathyroid glands.


When should I order a Parathyroid Hormone (PTH) Blood Test Plus Calcium?

Individuals may order this PTH Blood Test Plus Calcium if they have experienced symptoms related to abnormal calcium levels in the blood. Individuals with excess blood calcium levels may experience the following symptoms:


  • Increased thirst
  • Frequent urination
  • Mental changes, such as fatigue or confusion
  • Bone pain
  • Muscle twitching
  • Muscle weakness
  • Digestive upset, including nausea, appetite loss, and constipation


Additionally, symptoms of a calcium deficiency may include:


  • Muscle cramps
  • Dry skin
  • Brittle fingernails
  • Tingling in the lips, fingers, or feet
  • Seizures
  • Abnormal heart rhythm

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