Parathyroid Hormone Intact and Calcium


This test is useful in making the diagnosis of primary hyperparathyroidism, and secondary hyperparathyroidism and a differential diagnosis of hypercalcemia.

Parathyroid hormone (PTH) helps the body maintain stable levels of calcium in the blood.

PTH directly promotes the release of calcium from bones into the bloodstream.

It directly acts on the kidneys to reduce the elimination of calcium in the urine while promoting the elimination of phosphorus in the urine.

The indirect effect stimulates the kidneys to convert vitamin D from the inactive to the active form, which in turn increases the absorption of calcium from food in the intestines.


Parathyroid Hormone Intact and Calcium


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Reference Range(s)

Age Male (mg/dL) Female (mg/dL)
<1 Month 8.4-10.6 8.4-10.6
1-11 Months 8.7-10.5 8.7-10.5
1-3 Years 8.5-10.6 8.5-10.6
4-19 Years 8.9-10.4 8.9-10.4
20-49 Years 8.6-10.3 8.6-10.2
>49 Years 8.6-10.3 8.6-10.4

Parathyroid Hormone, Intact
<6 Years Not established
6-9 Years 9-59 pg/mL
10-13 Years 11-74 pg/mL
14-17 Years 9-69 pg/mL
>17 Years 14-64 pg/mL

Interpretive Guide
  Intact PTH Calcium
Normal Parathyroid Normal Normal
Hypoparathyroidism Low or Low Normal Low
  Primary Normal or High High
  Secondary High Normal or Low
  Tertiary High High
  Hypercalcemia Low or Low Normal High
  • Fasting Required: No
  • Preferred Specimen: Plasma
  • Turnaround Time: 3 Days
  • Test Code: 8837