Q: How do I interpret the MELD score for inpatient management?

MELD (Model for End-Stage Liver Disease) predicts 90-day mortality in cirrhosis. MELD <10 suggests low short-term mortality; 10–19 is moderate risk; 20–29 requires close monitoring; ≥30 indicates high mortality and typically prompts urgent transplant evaluation. For inpatient admissions, MELD helps guide ICU admission decisions and goals-of-care conversations.

Q: Which eGFR equation should I use?

For most adults, the CKD-EPI 2021 equation (without race variable) is the current standard. The Cockcroft-Gault equation (creatinine clearance) is preferred for medication dosing decisions, particularly for renally-cleared drugs. MDRD is older and less accurate but still widely reported by some labs. Use CKD-EPI for kidney disease staging and CKD-EPI or Cockcroft-Gault for dosing.

Q: When is the anion gap elevated and what does it mean?

The anion gap (AG = Na − (Cl + HCO₃)) is normally 8–12 mEq/L. An elevated AG (>12) indicates excess unmeasured anions, classically from MUDPILES: Methanol, Uremia, Diabetic ketoacidosis, Propylene glycol, Isoniazid/Iron, Lactic acidosis, Ethylene glycol, Salicylates. Always check the delta-delta ratio when AG is elevated to identify concurrent non-AG metabolic acidosis.

Question 1

When should I anticoagulate based on CHA₂DS₂-VASc?

Accepted Answer

Current AHA/ACC guidelines recommend oral anticoagulation for non-valvular AFib with CHA₂DS₂-VASc ≥2 in men or ≥3 in women. A score of 1 (men) or 2 (women) warrants shared decision-making. A score of 0 (men) or 1 (women) does not benefit from anticoagulation. Always pair with HAS-BLED to balance bleeding risk and re-assess annually.

Question 2

What is the RCRI score used for?

Accepted Answer

The Revised Cardiac Risk Index (RCRI) predicts major cardiac events after non-cardiac surgery. Six risk factors are scored (1 point each): high-risk surgery, ischemic heart disease, congestive heart failure, cerebrovascular disease, diabetes on insulin, and pre-op creatinine >2.0 mg/dL. RCRI 0–1: low risk (<1% MACE); RCRI 2: intermediate (~1%); RCRI ≥3: high risk (≥3%). It guides pre-op cardiac workup decisions.

Question 3

How do I interpret the MELD score for inpatient management?

Accepted Answer

MELD (Model for End-Stage Liver Disease) predicts 90-day mortality in cirrhosis. MELD <10 suggests low short-term mortality; 10–19 is moderate risk; 20–29 requires close monitoring; ≥30 indicates high mortality and typically prompts urgent transplant evaluation. For inpatient admissions, MELD helps guide ICU admission decisions and goals-of-care conversations.

Question 4

Which eGFR equation should I use?

Accepted Answer

For most adults, the CKD-EPI 2021 equation (without race variable) is the current standard. The Cockcroft-Gault equation (creatinine clearance) is preferred for medication dosing decisions, particularly for renally-cleared drugs. MDRD is older and less accurate but still widely reported by some labs. Use CKD-EPI for kidney disease staging and CKD-EPI or Cockcroft-Gault for dosing.

Question 5

When is the anion gap elevated and what does it mean?

Accepted Answer

The anion gap (AG = Na − (Cl + HCO₃)) is normally 8–12 mEq/L. An elevated AG (>12) indicates excess unmeasured anions, classically from MUDPILES: Methanol, Uremia, Diabetic ketoacidosis, Propylene glycol, Isoniazid/Iron, Lactic acidosis, Ethylene glycol, Salicylates. Always check the delta-delta ratio when AG is elevated to identify concurrent non-AG metabolic acidosis.

Medical Calculators for Hospitalists and Internal Medicine

Curated Tools for Hospitalists & Internal Medicine (12)

CHA₂DS₂-VASc Score

HAS-BLED Score

RCRI Score

HEART Score

Wells Score (PE)

MELD Score

Child-Pugh Score

Charlson Index

eGFR Calculator

Anion Gap

Corrected Calcium

CURB-65 Score

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