TABLE 410-5 Functional Classification of Hypocalcemia (Excluding Neonatal Conditions)
PTH Absent
Hereditary hypoparathyroidism Acquired hypoparathyroidism	Hypomagnesemia
PTH Ineffective
Chronic kidney disease Active vitamin D lacking ↓ Dietary intake or sunlight Defective metabolism: Anticonvulsant therapy Vitamin D–dependent rickets type I	Active vitamin D ineffective Intestinal malabsorption Vitamin D–dependent rickets type II Pseudohypoparathyroidism Mutant, less active PTH
PTH Overwhelmed
Severe, acute hyperphosphatemia Tumor lysis Acute kidney injury Rhabdomyolysis	Osteitis fibrosa after parathyroidectomy
Abbreviation: PTH, parathyroid hormone.

증상:
- 입 주위, 손, 발가락 끝이 저리고 감각이상
- 근육 강직성 경련(Tetany)
- Chvostek’s sign(+): 혈압대를 찬 손이 palmar flexion과 함께 spasm을 보이는 경우
- Trousseau’s sign(+): 귀 앞쪽 아래 얼굴부위를 건드리면, 그 부위로 찡긋거리는 경우
검사결과:

	Ca	P	PTH	ALP
Vit. D 결핍	-	▼	▲	▲
Renal osteodystrophy	▼	▲	▲	-
부갑상샘저하증	▼	▲	▼	-

출처: Harrison 21e, p3186

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