PTH (parathyroid hormone) controls calcium levels in the blood. It is made by four small glands in the neck.
- Normal range (adults)
- 15–65 pg/mL (1.59–6.9 pmol/L)
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- PTH, Intact PTH, iPTH, Serum PTH
Parathyroid Hormone normal range
| Group | pg/mLConventional units: US, South Asia | pmol/LSI units: UK, Europe, Australia, international |
|---|---|---|
| Adults | 15–65 | 1.59–6.9 |
Your report may use either unit system; labs in the Gulf often print both. Ranges also vary slightly between laboratories, so the range printed on your own report is the one to go by.
Why is the Parathyroid Hormone test done?
It is checked when calcium is abnormal, in kidney disease and in vitamin D deficiency.
What does a high Parathyroid Hormone level mean?
A high PTH is most often the body's response to low vitamin D or kidney disease. If calcium is also high, it suggests an overactive parathyroid gland.
Common causes
- Vitamin D deficiency (very common)
- Chronic kidney disease
- Low calcium intake
- Primary hyperparathyroidism
Diet and lifestyle tips
- Correct vitamin D deficiency: sunlight, oily fish, eggs, supplements as advised
- Eat calcium-rich foods unless your calcium is already high
- Drink plenty of water
What does a low Parathyroid Hormone level mean?
A low PTH is usually seen when calcium is high from another cause, or after neck surgery.
Common causes
- High calcium from other causes
- After thyroid or parathyroid surgery
- Low magnesium
Diet and lifestyle tips
- Follow your doctor's calcium and vitamin D advice
When should you see a doctor?
PTH is always read together with calcium and vitamin D.
Last updated
This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.