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hypercalcemia-severity-classifier

Classify the severity of hypercalcemia at the bedside — mild, moderate, or severe — by combining the corrected/ionized calcium level with the acuity and symptom pattern, and decide whether the patient needs urgent therapy. Trigger when a clinician asks "is this hypercalcemia severe", "how bad is this calcium level", "when to admit for hypercalcemia", "is this hypercalcemic crisis", "how to grade hypercalcemia", or shares a calcium level and asks how worried to be.

The English summary is being prepared. Showing the original description.

dromlakhani/MD2SKILL
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Hypercalcemia — Severity Classifier

Use this skill the moment a high serum calcium is reported, before launching workup or treatment.

STEP 1 — Confirm the calcium is real

Before grading, rule out pseudo-hypercalcemia:

  • Apply albumin correction: Corrected Ca (mg/dL) = measured total Ca + [(4.0 − serum albumin g/dL) × 0.8] (or in SI units: Corrected Ca mM = measured total Ca + [(40 − albumin g/L) × 0.02])
  • If serum albumin is high (dehydration / haemoconcentration) → suspect pseudo-hypercalcemia.
  • If pH is significantly altered (acidosis lowers, alkalosis raises Ca²⁺ binding) → measure ionized calcium directly.
  • Reference range total Ca: 8.5–10.5 mg/dL (2.12–2.62 mM). Ionized Ca: 4.65–5.25 mg/dL (1.16–1.31 mM).

If still hypercalcemic on corrected or ionized values → proceed to Step 2.

STEP 2 — Stratify by calcium level

SeverityCorrected Ca (mg/dL)Corrected Ca (mM)
Mild10.5 – 12.02.62 – 3.0
Moderate12.0 – 14.03.0 – 3.5
Severe> 14.0> 3.5

STEP 3 — Layer in acuity and symptoms

Tolerance depends on how fast the calcium rose, not just the number.

Acute hypercalcemia (rapid rise) — typically symptomatic at lower levels

  • GI: anorexia, nausea, vomiting
  • Renal: polyuria, polydipsia, dehydration, AKI
  • Neuro: depression, confusion, hyporeflexia, stupor, coma
  • Cardiac: short QT, prolonged PR, widened QRS, bradycardia, digitalis sensitivity, arrhythmia

Chronic hypercalcemia (gradual rise) — milder, often "asymptomatic"

  • GI: dyspepsia, constipation, pancreatitis
  • Renal: nephrolithiasis, nephrocalcinosis, slow CKD progression
  • Neuro: weakness, lethargy
  • Cardiac: hypertension

STEP 4 — Final classification & action

Final gradeTriggerAction
Asymptomatic mild (Ca <12, no symptoms)Most outpatient PHPTTreat the underlying cause. Avoid Ca >1000 mg/d intake, immobilisation, thiazides. Outpatient workup.
Symptomatic moderate (Ca 12–14 + symptoms) OR any moderate with rapid riseOften MAH, severe PHPTAdmit. Start hydration ± antiresorptive. Workup in parallel.
Severe (Ca >14, or any level with stupor / coma / arrhythmia / AKI)Hypercalcemic crisisMedical emergency. ECG, IV access, normal saline bolus, denosumab or IV bisphosphonate, ± calcitonin for rapid drop, consider dialysis if refractory or renal failure.

Patients with serum Ca >14 mg/dL (3.5 mM) are almost always symptomatic and need urgent measures.

CLINICAL GUARDRAILS

  • Albumin-corrected calcium is approximate, not exact — when in doubt, get an ionized calcium.
  • A "normal" total calcium with low albumin can still be true hypercalcemia. Check the corrected value.
  • A patient with mildly elevated calcium but new confusion is severe, regardless of the number. Acuity > level.
  • Don't anchor on "asymptomatic" — patients minimise polyuria, constipation, mood change. Ask specifically.
  • ECG is mandatory in severe hypercalcemia, especially if on digoxin — short QT and digitalis toxicity are real.
  • Dehydration masks the calcium level. Rehydration may transiently raise corrected Ca by unmasking; always rehydrate before trusting a follow-up value.

SOURCE

Bilezikian JP, Endotext. Approach to Hypercalcemia. NCBI Bookshelf NBK279129. Section: Definition of Hypercalcemia; Clinical Assessment; Table 2.

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