Chapter 25: Pediatric and Adult Dosage Calculation Based on Weight

Chapter 25: Pediatric and Adult Dosage Calculation Based on Weight

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

6. Directions: Round dosage and weight to the nearest tenth as indicated. Use labels where provided.

The recommended dosage of Mezlin for an adult with a serious infection is 200 to 300 mg/kg/day given in four to six divided dosages. The adult weighs 175 lb.

1. What is the adult’s weight in kilograms? _____
2. What is the 24-hour dosage range for the 175-lb adult in milligrams? _____
3. What is the dosage range in grams? _____

ANS:

2. 175 lb ÷2.2 = 79.54 = 79.5 kg
3. 79.5 kg ´ 200 mg/kg/day = 15,900 mg/day

79.5 kg ´ 300 mg/kg/day = 23,850 mg/day

The dosage range is 15,900 to 23,850 mg/day.

1. 1 g = 1,000 mg

15,900 mg ÷ 1,000 = 15.9 g

23,850 mg ÷ 1,000 = 23.85 g = 23.9 g

The dosage range is 15.9 g to 23.9 g/day.

PTS:   1                    MSC:  Calculation Based on Weight

7. Directions: Round dosage and weight to the nearest tenth as indicated. Use labels where provided.

The recommended dosage of Ticar for an adult with a complicated urinary tract infection is 150 to 200 mg/kg/day IV in divided dosages every 4 or 6 hours. The adult weighs 194 lb.

1. What is the 24-hour dosage range for the 194-lb adult in milligrams? _____
2. What is the dosage range in grams? _____
3. The prescriber ordered 4 g IV q6h. Is the dosage ordered safe? _____ Explain: ______________________________

ANS:

2. 194 lb ÷ 2.2 = 88.18 = 88.2 kg

88.2 kg ´ 150 = 13,230 mg/day

88.2 kg ´ 200 = 17,640 mg/day

The dosage range is 13,230 to 17,640 mg/day.

1. 1 g = 1,000 mg

13,230 mg ÷ 1,000 = 13.23 = 13.2 g

17,640 mg ÷ 1,000 = 17.64 = 17.6 g

The dosage range is 13.2 to 17.6 g/day.

13. Yes. The dosage is safe. 4 g ´ 4 = 16 g/day. It falls within the safe range of 13.2 to 17.6 g/day.

PTS:   1                    MSC:  Calculation Based on Weight

8. Directions: Using the West nomogram, determine the body surface area (BSA) for a child with the height and weight given.

32 inches and 25 lb: _____ m²

ANS:  0.54

PTS:   1                    MSC:  Calculation Based on Weight

9. Directions: Using the West nomogram, determine the body surface area (BSA) for a child with the height and weight given.

80 cm and 11 kg: _____ m²

ANS:  0.5

PTS:   1                    MSC:  Calculation Based on Weight

10. Directions: Using the West nomogram, determine the body surface area (BSA) for a child with the height and weight given.

22 inches and 10 lb: _____ m²

ANS:  0.27

PTS:   1                    MSC:  Calculation Based on Weight