The nurse has administered warfarin 2.5 mg orally daily for three days to a client who has deep vein thrombosis. The client's International Normalized Ratio (INR) today is 5.0. The nurse notifies the healthcare provider because today's dose of the medication should be:

Choice A Reason
While maintaining a stable blood pressure is important for a client with hypertension, furosemide is primarily a diuretic, and its therapeutic effect is to reduce fluid overload, not directly to stabilize blood pressure. Therefore, this finding alone does not best indicate the therapeutic effect of furosemide.

Choice B Reason
Clear lungs upon auscultation suggest an improvement in pulmonary edema, which can be associated with fluid overload in conditions such as heart failure. However, for a client with peripheral edema, the primary therapeutic goal of furosemide is to reduce the excess fluid in the extremities, not just the lungs.

Choice C Reason
A decrease in serum potassium is a known side effect of furosemide due to its action on the kidneys, leading to increased excretion of potassium. While it's important to monitor for hypokalemia, a decrease in potassium does not directly indicate the therapeutic effect of reducing edema.

Choice D Reason
An increase in urine output from 30 mL per hour to 100 mL per hour is a direct indication that furosemide is achieving its therapeutic effect. Furosemide is a loop diuretic that increases urine production to help the body eliminate excess fluid, thereby reducing edema associated with conditions like hypertension.

Choice A Reason
A potassium level of 5.0 mEq/L is at the upper limit of the normal range, which is typically between 3.5 and 5.0 mEq/L. While this level should be monitored, especially in the context of diabetes where the patient may be at risk for hyperkalemia due to potential kidney issues, it is not immediately alarming¹.

Choice B Reason
A creatinine level of 4.4 mg/dL is significantly higher than the normal range of 0.6 to 1.2 mg/dL for males and 0.5 to 1.1 mg/dL for females. This indicates severe renal impairment or kidney failure, which is a serious complication of diabetes mellitus. Immediate intervention is required to address this critical issue¹.

Choice C Reason
A hemoglobin level of 10.7 g/dL is slightly below the normal range for adults, which is generally 13.8 to 17.2 g/dL for males and 12.1 to 15.1 g/dL for females. This could indicate mild anemia, which can be a complication of diabetes but is not as immediately concerning as a high creatinine level¹.

Choice D Reason
A Blood Urea Nitrogen (BUN) level of 22 mg/dL is within the normal range, which is typically between 7 and 20 mg/dL. This level does not indicate immediate concern and is not as critical as the elevated creatinine level¹.