A client's laboratory results show serum calcium of 12.5 mg/dL (normal 8.5-10.5 mg/dL). Which clinical finding is MOST consistent with hypercalcemia?

HYPERCALCEMIA is defined as serum calcium >10.5 mg/dL. Normal: 8.5-10.5 mg/dL. A level of 12.5 mg/dL is significantly elevated. CLINICAL MNEMONIC for hypercalcemia: 'BONES, GROANS, MOANS, AND STONES':

Bones: bone pain and pathological fractures — calcium is being leached from bones (especially in malignancy or hyperparathyroidism).

Groans: GI symptoms — nausea, vomiting, anorexia, CONSTIPATION (calcium decreases GI motility), abdominal pain.

Moans: neuropsychiatric — confusion, depression, psychosis, altered mental status, DECREASED DEEP TENDON REFLEXES (calcium stabilizes nerve membranes, reducing excitability), muscle weakness, fatigue, lethargy.

Stones: kidney stones (calcium oxalate or calcium phosphate) — polyuria, nephrolithiasis, nephrocalcinosis.

Cardiac effects: shortened QT interval on ECG (calcium shortens repolarization); dysrhythmias in severe cases.

Contrast with hypocalcemia: TETANY (muscle spasms, cramping); POSITIVE TROUSSEAU'S SIGN (carpal spasm when BP cuff inflated above systolic for 3 minutes); POSITIVE CHVOSTEK'S SIGN (facial muscle twitch when tapping the facial nerve anterior to the ear); PARESTHESIAS (perioral, fingertips); SEIZURES; INCREASED DEEP TENDON REFLEXES; PROLONGED QT INTERVAL on ECG.

Causes of hypercalcemia: MALIGNANCY (most common in hospitalized patients — bone metastases, PTH-related protein secretion); PRIMARY HYPERPARATHYROIDISM (most common cause overall in outpatients); vitamin D toxicity; prolonged immobilization; thiazide diuretics; sarcoidosis; milk-alkali syndrome.

Treatment: IV NORMAL SALINE (first-line — hydration promotes renal calcium excretion); FUROSEMIDE (after adequate hydration — promotes calciuresis); BISPHOSPHONATES (for malignancy-associated hypercalcemia); CALCITONIN (rapid but temporary); CORTICOSTEROIDS (for vitamin D-related causes, sarcoidosis); DIALYSIS (severe refractory cases).

Pn role: monitor for symptoms; hydration; fall risk (weakness, confusion); educate on adequate hydration; report severe symptoms or rapidly rising values.