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Parathyroid Hormone

PTH Intact PTH iPTH
EDTA plasma (on ice, process promptly) pmol/L

About this test

Peptide hormone from parathyroid glands regulating calcium and phosphate homeostasis. Intact PTH (1–84) is the active form measured by modern assays.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 1.6 – 7.2 Adult intact PTH; interpret with calcium, phosphate, and vitamin D

Clinical Interpretation

Low / Decreased
Low PTH with hypercalcaemia — hypercalcaemia of malignancy (PTHrP), vitamin D toxicity, sarcoidosis, immobilisation.
High / Increased
Elevated PTH — primary hyperparathyroidism (with hypercalcaemia), secondary hyperparathyroidism (CKD, vitamin D deficiency — with low/normal calcium), tertiary hyperparathyroidism (renal transplant).

Related Tests

Adjusted Calcium Phosphate
Specimen
EDTA plasma (on ice, process promptly)
Reporting Unit
pmol/L
Category
⚗️ Endocrinology

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.