Dosage Calculation NCLEX RN Questions

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The nurse is calculating the 12-hour intake for a client. The client received: ,¢ 0.45% saline at 85 mL/hr via continuous infusion ,¢ One eight-ounce cup of ice chips ,¢ One eight-ounce cup of coffee ,¢ One eight-ounce cup of ice cream ,¢ Three eight-ounce cups of water ,¢ One eight-ounce cup of pureed vegetables. The nurse should calculate the client's total liquid intake as how many mL? Fill in the blank.

Correct Answer: 1770 mL

Rationale: Calculate IV fluid: 85 mL/hr × 12 hr = 1020 mL. Each 8-ounce cup = 240 mL (since 1 oz ≈ 30 mL). Ice chips count as half volume: 240 mL ÷ 2 = 120 mL. Total: 1020 mL + 120 mL (ice chips) + 240 mL (coffee) + 240 mL (ice cream) + 720 mL (3 cups water) + 240 mL (vegetables) = 1770 mL.

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The primary healthcare provider (PHCP) prescribes 500 mL of 0.45% saline to be administered over one hour. The drop factor is 10 gtts/mL. How many drops per minute should the nurse set the flow rate at? Fill in the blank. Round your answer to the nearest whole number.

Correct Answer: 83 gtts/minute

Rationale: To calculate drops per minute, use the formula: (volume in mL × drop factor) ÷ time in minutes. Here, 500 mL × 10 gtts/mL = 5000 gtts, divided by 60 minutes = 5000 ÷ 60 ≈ 83.33, rounded to 83 gtts/minute.

The nurse is caring for a client receiving a continuous infusion of heparin. The label reads 25,000 units of heparin in 500 mL of Dextrose 5% in water (D5W). The client is receiving 1,250 units per hour. How many milliliters (mL) did the client receive in an eight-hour shift? Fill in the blank.

Correct Answer: 400 mL

Rationale: Calculate mL/hr: (1250 units/hr ÷ 25,000 units) × 500 mL = 25 mL/hr. For 8 hours: 25 mL/hr × 8 hr = 400 mL.

The client is prescribed 3 g/hr of intravenous magnesium sulfate via continuous infusion. The label reads 20g of magnesium sulfate in 1000 mL of normal saline. How many mL/hr should the nurse set the pump to deliver the prescribed dose? Fill in the blank.

Correct Answer: 150 mL/hr

Rationale: Calculate: (3 g/hr ÷ 20 g) × 1000 mL = 150 mL/hr.

The nurse is calculating intake for a client. The client received: ,¢ Two 100 mL intravenous antibiotics ,¢ Two eight-ounce cups of ice ,¢ One eight-ounce cup of coffee ,¢ Three eight-ounce cups of water. The nurse should document the client's total intake as how many mL? Fill in the blank.

Correct Answer: 1160 mL

Rationale: Convert ounces to mL: 8 oz = 240 mL. Ice counts as half volume: 240 mL ÷ 2 = 120 mL per cup. Total: 200 mL (antibiotics) + 240 mL (2 cups ice) + 240 mL (coffee) + 720 mL (3 cups water) = 1160 mL.

The primary healthcare provider (PHCP) prescribes 150 mL of sterile water to be administered over one hour. The drop factor is 15 gtts/mL. How many drops per minute will the nurse set the flow rate at? Fill in the blank. Round your answer to the nearest whole number.

Correct Answer: 38 gtts/minute

Rationale: Calculate: (150 mL × 15 gtts/mL) ÷ 60 min = 2250 gtts ÷ 60 = 37.5 gtts/min, rounded to 38 gtts/min.

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