RMA Medical Mathematics and Dosage Calculations 2

Question 1

An order reads: Infuse 250 mL of NS over 2 hours using a 10 gtt/mL IV set. What is the flow rate in drops per minute?

Accepted Answer

21 gtt/min

Answer

(250 mL × 10 gtt/mL) ÷ (2 hrs × 60 min) = 2,500 ÷ 120 ≈ 21 gtt/min.

Question 2

Convert 37°C to Fahrenheit using the formula F = (C × 9/5) + 32.

Accepted Answer

98.6°F

Answer

(37 × 9/5) + 32 = 66.6 + 32 = 98.6°F, which is normal body temperature.

Question 3

Which metric prefix represents one-thousandth (0.001) of the base unit?

Accepted Answer

Milli-

Answer

The prefix milli- denotes 1/1,000 (0.001) of the base unit, as in milligram or milliliter.

Question 4

A patient is ordered 0.4 mg of atropine IM. The vial contains 0.8 mg/mL. How many mL should be administered?

Accepted Answer

0.5 mL

Answer

(0.4 mg ÷ 0.8 mg/mL) × 1 mL = 0.5 mL.

Question 5

How many teaspoons are equivalent to 1 tablespoon?

Accepted Answer

3 teaspoons

Answer

1 tablespoon equals 3 teaspoons; since 1 teaspoon = 5 mL, 1 tablespoon = 15 mL.

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