Clarify the most dangerous discrepancy first
Medication reconciliation compares the medicines a client takes at home with the current orders, identifies every omission, duplication, and dose change, and resolves each with the prescriber. When several discrepancies exist, the one with the greatest risk of harm is clarified first. This client's INR is 2.6 on warfarin, which is already in the therapeutic range, and the admission orders continue warfarin while adding enoxaparin 40 mg daily. Two anticoagulants, both high-alert drugs, in a client who is already anticoagulated is a therapeutic duplication with a high bleeding risk, so this is clarified first.
Why the duplication is so risky
Enoxaparin is often added on admission for venous thrombosis prophylaxis, but a client with a therapeutic INR already has anticoagulant protection. Adding a low-molecular-weight heparin increases the risk of serious bleeding without a clear benefit. His kidney function adds to the danger: enoxaparin is cleared by the kidneys, and with an estimated glomerular filtration rate of 28 mL/min/1.73 m² the drug can accumulate, so even the prophylactic dose may need reduction when creatinine clearance is below 30 mL/min. An infected foot ulcer that may need debridement makes bleeding even more relevant.
| Discrepancy | Risk | Priority |
|---|
| Enoxaparin added while warfarin continues (INR 2.6) | Major bleeding from duplicate anticoagulation | First |
| Metformin omitted | Likely intentional: contraindicated with eGFR below 30 | Confirm |
| Atorvastatin omitted | No immediate danger from a short omission | Clarify later |
| Amlodipine continued at home dose | No discrepancy | None |
Why the other discrepancies rank lower
Metformin is contraindicated when the estimated glomerular filtration rate is below 30 because of the risk of lactic acidosis, and acutely ill clients with high glucose are usually managed with insulin, so its omission is probably intentional. It still needs to be confirmed and documented, but leaving it out is not dangerous. A missing statin should be clarified, but a short omission carries no immediate harm. Amlodipine is continued at the same dose, so there is no discrepancy at all.
Watch out! A discrepancy is not the same as an error. Some differences between home and admission medicines are deliberate. The nurse confirms each one, documents the reason, and acts first on the one that could cause harm soonest.
Exam takeaway
Key point! In reconciliation questions, rank by harm: duplicated high-alert drugs, especially anticoagulants, insulin, and opioids, come first. Also consider kidney function, which changes the safety of drugs such as enoxaparin and metformin. Then clarify omissions that carry less immediate risk.