The nurse is providing medications to an adult patient with a history of advanced kidney disease. Which laboratory finding indicates that the dosages of medications may need to be decreased?

A. Hemoglobin 12 mg/dL: Hemoglobin levels reflect the oxygen-carrying capacity of the blood and are not directly related to kidney function or medication dosage adjustments. This value is within the normal range and does not suggest a need for medication dosage changes. B. Glucose 100 mg/dL: Blood glucose levels are not directly related to kidney function and do not indicate the need to adjust medication dosages. This value is within normal limits. C. Creatinine 8 mg/dL: Creatinine levels are a key indicator of kidney function. A creatinine level of 8 mg/dL is significantly elevated, suggesting severe renal impairment. Medications that are excreted by the kidneys may need to be dosed lower or avoided altogether to prevent toxicity. D. Potassium 4.0 mEq/L: This is a normal potassium level and does not indicate the need for medication dosage adjustments. While potassium levels are important in kidney disease, this specific value does not suggest a dosage change is necessary.