medium · NCLEX-RN pharmacology
The RN is reviewing laboratory results for a client receiving high-dose methotrexate.
Which finding represents a 'Toxicity marker' requiring immediate leucovorin rescue timing evaluation?
- The presence of mild oral mucositis (Grade 1), for this client.
- A serum potassium of 3.8 mEq/L.
- A 50% rise in serum creatinine from the client's baseline.
- An absolute neutrophil count (ANC) of 2,500/mm3, for this client.
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