Parathyroid hormone
Also written: PTH
What it measures
The hormone that regulates calcium in the body.
Why it is ordered
Almost always read TOGETHER with calcium and vitamin D — alone it says little.
How to prepare
Ask in advance about fasting and the time of the draw.
Units
pg/mL ↔ pmol/L — convert here
What to ask
- Are calcium and vitamin D drawn at the same time
- What do the three together indicate
This page does not include reference ranges and does not say whether your number is high or low. Reference ranges differ between laboratories and between people — read yours on your own report, with your clinician.