Why would a nurse check a serum creatinine level?

Step 1 is to calculate the number of hours it will take to infuse 1000 mL at a rate of 200 mL per hour.

Step 2 is to divide the total volume by the rate of infusion:

1000 mL ÷ 200 mL/hr

Step 3 is to perform the division:

1000 ÷ 200 = 5

Result: 5 hours

Choice a reason: Measuring blood pressure in the right arm is not the appropriate action for checking the patency of an AV fistula. In fact, blood pressure measurements should be avoided on the arm with the fistula to prevent damage and ensure its proper function. The pressure from the cuff can impair blood flow through the fistula and potentially cause complications.
Choice b reason: Palpating for a thrill and auscultating for a bruit over the fistula is the correct method for assessing its patency. A thrill is a palpable vibration over the fistula, indicating blood flow through the vessel. A bruit is a whooshing sound heard with a stethoscope, also indicating blood flow. Both signs confirm that the fistula is functioning properly.
Choice c reason: Auscultating the right arm brachial pulse is not specific to checking the patency of an AV fistula. The brachial pulse reflects blood flow in the brachial artery, not the fistula. While assessing peripheral pulses is important, it does not provide specific information about the fistula's patency.
Choice d reason: Auscultating and palpating the right radial pulse is not the method used to assess an AV fistula's patency. The radial pulse provides information about peripheral circulation, but it does not directly indicate the function of the fistula. Checking for a thrill and bruit over the fistula is the most accurate way to assess its patency.