Dosage Calculation Made Easy Solving Problems Using Dimensional Analysis 8TH Edition Converting Units of Weight and Measure Introduction

Free preview · Original latest version

Sample questions from Dosage Calculation Made Easy Solving Problems Using Dimensional Analysis 8TH Edition Converting Units of Weight and Measure Introduction

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

1. 1.A medication label lists a patient's weight as 154 lb. Using 1 kg = 2.2 lb, what is the patient's weight in kilograms?

   • A.70 kg
   • B.338.8 kg
   • C.70.0 lb
   • D.33.9 kg

   Rationale: Convert pounds to kilograms by dividing by 2.2 lb/kg: 154 lb x (1 kg/2.2 lb) = 70 kg. Multiplying by 2.2 gives 338.8, which converts in the wrong direction. Option C leaves the weight in pounds, and option D results from an incorrect conversion factor. Set up the factor so the starting unit cancels.

2. 2.A patient weighs 66 kg. Using 1 kg = 2.2 lb, what is the weight in pounds?

   • A.30 lb
   • B.145.2 lb
   • C.66 lb
   • D.660 lb

   Rationale: Multiply by the conversion factor: 66 kg x (2.2 lb/1 kg) = 145.2 lb. Dividing by 2.2 produces about 30, the result for converting pounds to kilograms instead. Option C changes no units, and option D reflects an incorrect factor of 10. The kilogram unit should cancel in the setup.

3. 3.The prescribed dose is 0.4 g. How many milligrams should the nurse prepare?

   • A.40 mg
   • B.4 mg
   • C.400 mg
   • D.4,000 mg

   Rationale: Since 1 g = 1,000 mg, 0.4 g x (1,000 mg/1 g) = 400 mg. Option A is ten times too small, and option B is one hundred times too small. Option D is ten times too large. Moving from a larger metric unit to a smaller one increases the numerical value.

4. 4.A vial contains 750 mg of a medication. How many grams does this amount represent?

   • A.7.5 g
   • B.0.75 g
   • C.75 g
   • D.0.075 g

   Answer and rationale are in the full material.

5. 5.A provider prescribes 0.25 mg of a medication. How many micrograms is this?

   • A.25 mcg
   • B.2.5 mcg
   • C.2,500 mcg
   • D.250 mcg

   Answer and rationale are in the full material.