| ・Renal insufficiency | |
| ・Hypercalcemia | |
| ・Hyperphosphatemia | |
| ・Hyperparathyroidism (both primary and secondary) | |
| ・Over-suppression of i-PTH with adynamic bone disease | |
| ・Vitamin K deficiency | |
| ・Female sex | |
| ・Obesity | |
| ・Diabetes mellitus | |
| ・Hypoalbuminemia | |
| ・Rapid weight loss | |
| ・Thrombophilia (e.g., antithrombin III deficiency, protein C deficiency, protein S deficiency, or lupus anticoagulant) | |
| ・Skin trauma (e.g., from subcutaneous injections) | |
| ・Medications (e.g., warfarin, VDRA, calcium carbonate, corticosteroids, and recombinant PTH) |