Parathyroid Hormone: Normal, High and Low

Parathyroid hormone blood test is used to measure your parathyroid hormone (PTH) levels. Measuring PTH levels can help to explain the reason for abnormal calcium levels. Three forms of PTH are measured in this test: N-terminal, C-terminal and Intact molecule.

The normal ranges are as follows:

  • N-terminal: 8 to 24 pg/mL
  • C-terminal: 50 to 330 pg/mL
  • Intact molecule: 10 to 65 pg/mL

High values of parathyroid hormone may indicate:

  • Spinal cord injury
  • Low calcium unrelated to parathyroid glands
  • Inherited low vitamin D level
  • Kidney problems

Low values of parathyroid hormone may indicate:

  • Iron overload
  • Radiation exposure

Keywords: parathyroid hormone: normal, high and low

* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.