Summary:
| Disorder | Calcium | Phosphate | ALP | PTH | Key Clinical Notes |
|---|---|---|---|---|---|
| Osteoporosis | Normal | Normal | Normal | Normal | Fragility fractures; normal labs |
| Osteomalacia | ↓ | ↓ | ↑ | ↑ | Looser zones; vitamin D deficiency |
| Primary HPT | ↑ | ↓ | ↑ | ↑ | “Stones, bones, groans, moans” |
| Secondary HPT (CKD) | ↓ | ↑ | ↑ | ↑ | “Renal rickets”; phosphate retention |
| Tertiary HPT | ↑ | ↑ | ↑ | ↑ | Autonomous PTH secretion post‑CKD |
| Hypoparathyroidism | ↓ | ↑ | Normal | ↓ | Post‑thyroidectomy; tetany |
| Pseudohypoparathyroidism | ↓ | ↑ | Normal | ↑ | PTH resistance; short stature, round face |
| Paget’s disease | Normal | Normal | ↑ | Normal | Chaotic bone turnover; deformity |
| Osteopetrosis | Normal | Normal | Normal | Normal | “Marble bone”; pancytopenia |