ATI Protor Dosage Calculation

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Sample questions from ATI Protor Dosage Calculation

This material has 90 questions with answers and rationales. Here are the first 5.

1. 1.A 46-year-old client in an outpatient clinic has bacterial sinusitis, a temperature of 38.1 C, and no medication allergies. The prescription is amoxicillin 750 mg PO now. The available tablets contain 250 mg each. How many tablets should the nurse administer?

   • A.1 tablet
   • B.2 tablets
   • C.3 tablets
   • D.4 tablets

   Rationale: Divide the prescribed dose by the tablet strength: 750 mg / 250 mg = 3 tablets. One tablet provides only 250 mg, and 2 tablets provide only 500 mg. Four tablets provide 1,000 mg, which exceeds the prescription. The exam takeaway is to calculate the tablet count using matching units.

2. 2.A 72-year-old client on a medical unit reports incisional pain rated 6/10 after surgery. Respirations are 16/min, and oxygen saturation is 97%. The prescription is acetaminophen oral solution 650 mg, and the label reads 160 mg/5 mL. How many mL should the nurse administer, rounded to the nearest tenth?

   • A.10.2 mL
   • B.20.3 mL
   • C.25.0 mL
   • D.40.6 mL

   Rationale: Calculate 650 mg x 5 mL / 160 mg = 20.3125 mL, which rounds to 20.3 mL. A volume of 10.2 mL provides approximately half the prescribed dose. The 25.0 mL and 40.6 mL options provide excessive doses. The exam takeaway is to preserve precision until the final rounding step.

3. 3.A 6-year-old child weighing 24 kg is treated in an urgent care clinic for otitis media. Temperature is 38.4 C, and renal function is normal. The prescription is amoxicillin 80 mg/kg/day PO divided into 2 equal doses. The suspension contains 400 mg/5 mL. How many mL should the nurse administer per dose?

   • A.6 mL
   • B.10 mL
   • C.24 mL
   • D.12 mL

   Rationale: The daily dose is 80 mg x 24 kg = 1,920 mg, and each of 2 doses is 960 mg. At 400 mg/5 mL, 960 mg requires 12 mL. Six mL provides half the intended dose, 10 mL underdoses the child, and 24 mL delivers the entire daily amount at once. The exam takeaway is to distinguish mg/kg/day from mg/kg/dose.

4. 4.A 4-year-old child weighing 18 kg is admitted with cellulitis and a temperature of 38.6 C. Cefazolin 500 mg IV every 8 hours is prescribed. The medication reference lists a recommended range of 50 to 100 mg/kg/day divided every 8 hours for this indication. Which interpretation is correct?

   • A.The prescription is within the recommended range because it provides approximately 83 mg/kg/day.
   • B.The prescription is below the recommended range because it provides approximately 28 mg/kg/day.
   • C.The prescription exceeds the recommended range because it provides 1,500 mg/day.
   • D.The prescription exceeds the recommended range because each dose must contain at least 900 mg.

   Answer and rationale are in the full material.

5. 5.A 63-year-old client in the emergency department has dehydration, blood pressure 104/66 mm Hg, and heart rate 102/min. The prescription is 0.9% sodium chloride 1,000 mL IV over 8 hours. At how many mL/hr should the nurse program the pump?

   • A.80 mL/hr
   • B.100 mL/hr
   • C.125 mL/hr
   • D.150 mL/hr

   Answer and rationale are in the full material.