🦴 Calcium / PTH Interpretation
PTH-based aetiology triage of hyper- and hypocalcaemia, the assessment sequence and the CKD-MBD pattern. Browser-side reference.
Calcium / PTH Interpretation
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When to use
Confirm true calcium disturbance, then classify by whether PTH is appropriate — PTH is the watershed.
How it works
Core panel: calcium + phosphate + PTH (+ 25-OH-D, magnesium, creatinine). Confirm with corrected/ionised calcium first.
Key points
- Correct for albumin or measure ionised calcium before acting.
- Hypercalcaemia with PTH ↑: primary hyperparathyroidism, FHH, lithium.
- Hypercalcaemia with PTH ↓: malignancy, vitamin D toxicity, granulomatous disease.
- Correct low magnesium first in hypocalcaemia.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.