Deck 25: Pediatric and Adult Dosage Calculation Based on Weight

Question 1

Directions: Using the West nomogram or formula when indicated,calculate the following dosages.Express answer to the nearest tenth.
The recommended dosage of methotrexate is 25 to 75 mg/m²/wk.The child's height is 30 inches and the weight is 25 lb.
a.What is the child's BSA? _____
b.What is the recommended dosage range? _____

Answer 1

a.0.49 m²
b.25 mg/m² * 0.49 m² = 12.25 = 12.3 mg
7g mg/m² * 0.49 m² = 36.75 = 36.8 mg
The dosage range is 12.3 to 36.8 mg.

Question 2

Directions: Round dosage and weight to the nearest tenth as indicated.Use labels where provided.
Erythromycin ethylsuccinate 62.5 mg p.o.q6h is ordered for an infant weighing 10 lb 4 oz.The recommended safe dosage is 30 to 50 mg/kg/24 hr divided q6h.
a.What is the infant's weight in kilograms? _____
b.What is the safe 24-hour dosage range for this infant? _____
c.What is the divided dosage range? _____
d.Is the dosage ordered safe? (Prove mathematically. )_______________ Explain your action: ______________________________

Answer 2

a.16 oz = 1 lb 4 oz = 0.25 lb = 0.3 lb
2 lb = 1 kg
10.3 lb ÷ 2.2 = 4.68 = 4.7 kg
b.4.7 kg * 30 mg/kg/24hr = 141 mg/24 hr
4.7 kg x 50 mg/kg/24hr = 235 mg/24hr
The dosage range 141 to 235 mg/day.
c.141 mg ÷ 4 = 35.25 = 35.3 mg q6h
235 mg ÷ 4 = 58.75 = 58.8 mg q6h
The divided dosage range is 35.3 to 58.8 mg q6h.
d.No.The dosage is 62.5 mg * 4 = 250 mg/day.It exceeds the safe dosage range of 141 to 235 mg/day.Notify the prescriber.

Question 3

Directions: Using the West nomogram,determine the body surface area (BSA)for a child with the height and weight given.
170 cm and 50 kg: _____ m²

Answer 3

1.55

Question 4

Directions: Use the appropriate formula to determine BSA.Express answer to the nearest hundredth.
A child who measures 26 inches and weighs 36 lb: _____ m²

Question 5

Directions: Use the appropriate formula to determine BSA.Express answer to the nearest hundredth.
An adult who is 67 inches tall and weighs 175 lb: _____ m²

Question 6

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

Question 7

Directions: Using the West nomogram or formula when indicated,calculate the following dosages.Express answer to the nearest tenth.
The recommended dosage of Zovirax for a child who is immunosuppressed and has a varicella-zoster infection is 500 mg/m².The child weighs 26.5 lb and is 58 inches tall.
a.What is the child's BSA? _____
b.What is the recommended dosage? _____

Question 8

Directions: Using the West nomogram or formula when indicated,calculate the following dosages.Express answer to the nearest tenth.
The recommended dosage of acyclovir is 250 mg/m².What will be the dosage for a child with a BSA of 0.27 m²? _____

Question 9

Directions: Determine the volume of solution that must be added to the burette in the following problem.Determine the rate in gtt/min for each IV when a microdrop is used,then the rate in mL/hr for a controller.
The volume of a 75-mg dosage of medication is 3 mL.Dilute to 55 mL and infuse over 45 minutes.
a.Dilution volume: _____
b.gtt/min: _____
c.mL/hr: _____

Question 10

Directions: Use the appropriate formula to determine BSA.Express answer to the nearest hundredth.
An adolescent who measures 157.5 cm and weighs 59.1 kg: _____ m²

Question 11

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

Question 12

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.
a.What is the adult's weight in kilograms? _____
b.What is the 24-hour dosage range for the 175-lb adult in milligrams? _____
c.What is the dosage range in grams? _____

Question 13

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

Question 14

Directions: Round dosage and weight to the nearest tenth as indicated.Use labels where provided.
Phenobarbital 45 mg p.o.
b.i.d.
b.i.d.is ordered for a child with seizures weighing 35 lb.The recommended dosage is 6 to 8 mg/kg/24 hr,given every day or
a.What is the child's weight in kilograms? _____
b.What is the safe 24-hour dosage range for this child? _____
c.Is the dosage ordered safe? (Prove mathematically. )_______________ Explain your action: ______________________________

Question 15

Directions: Use the appropriate formula to determine BSA.Express answer to the nearest hundredth.
An adult who measures 175 cm and weighs 85 kg: _____ m²

Question 16

Directions: Round dosage and weight to the nearest tenth as indicated.Use labels where provided.
Gentamicin 45 mg IV q8h for a child weighing 45 lb.The recommended dosage is 6 to 7.5 mg/kg/day in three to four divided dosages.
a.What is the child's weight in kilograms? _____
b.What is the safe 24-hour dosage range for this child? _____
c.What is the divided dosage range? _____
d.Is the dosage ordered safe? (Prove mathematically. )_______________ Explain your action: ______________________________

Question 17

Directions: Round dosage and weight to the nearest tenth as indicated.Use labels where provided.
Order: Albuterol 1.2 mg p.o.t.i.d.is ordered for a child weighing 27 lb.The recommended dosage is 0.3 mg/kg/24 hr divided q8h.
Available:
a.What is the child's weight in kilograms? _____
b.What is the safe 24-hour dosage for this child? _____
c.What is the divided dosage? _____
d.Is the dosage ordered safe? (Prove mathematically. )_______________ Explain your action: ______________________________
e.How many milliliters of albuterol are needed to administer the dosage? _____

Question 18

Directions: Using the West nomogram or formula when indicated,calculate the following dosages.Express answer to the nearest tenth.
The recommended dosage of Paraplatin for ovarian cancer is 360 mg/m².The client's BSA is 1.67 m².What dosage should the client receive? _____

Question 19

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

Question 20

Directions: Round dosage and weight to the nearest tenth as indicated.Use labels where provided.
Order: Ceclor (cefaclor)100 mg p.o.q8h is ordered for a child weighing 32 lb.The recommended dosage is 20 to 40 mg/kg/day divided q8h.
Available:
a.What is the child's weight in kilograms? _____
b.What is the safe 24-hour dosage range for this child? _____
c.Is the dosage ordered safe? (Prove mathematically. )_______________ Explain your action: ______________________________
d.How many milliliters of Ceclor are needed to administer the dosage? _____

Question 21

Directions: Determine the volume of solution that must be added to the burette in the following problem.Determine the rate in gtt/min for each IV when a microdrop is used,then the rate in mL/hr for a controller.
A medication of 1 g in 4 mL is to be diluted to 60 mL and infused over 90 minutes.
a.Dilution volume: _____
b.gtt/min: _____
c.mL/hr: _____

Question 22

Directions: Calculate the following children's dosages.
Order: Amoxil 75 mg p.o.q8h
Available: How many milliliters will you administer? _____ mL

Question 23

Directions: Determine the normal dosage range to the nearest tenth.State your course of action.
An IV medication of 50 mcg in 200 mL is ordered to infuse over 2 hours.The normal dosage range is 1.5 to 3 mcg/kg/hr.The child weighs 5.7 kg.Determine the dosage range per hour.Determine whether the dosage ordered is within normal limits.State your course of action: ______________________________

Question 24

Directions: Calculate the following children's dosages.
Order: Kantrex 65 mg IV q8h
Available: How many milliliters will you administer? _____ mL

Question 25

Directions: Calculate the following children's dosages.
Order: Garamycin 15 mg IV q8h
Available: How many milliliters will you administer? _____ mL

Question 26

Directions: Calculate the following children's dosages.
Order: Kefzol 185 mg IV q6h
Available: How many milliliters will you add to the IV? _____ mL

Question 27

Directions: Calculate the following children's dosages.
Order: Lanoxin (digoxin)elixir 0.1 mg p.o.daily
Available: How many milliliters will you administer? _____ mL

Question 28

Directions: Calculate the following children's dosages.
Order: Epinephrine 0.25 mg IV stat
Available: Epinephrine 0.1 mg/mL
How many milliliters will you prepare to administer? _____ mL

Question 29

Directions: Calculate the following children's dosages.
Order: Nebcin 35 mg IV q8h
Available: How many milliliters will you administer? _____ mL

Question 30

Directions: Determine the normal dosage range to the nearest tenth.State your course of action.
A child weighing 16.4 kg is to receive a medication IV with a dosage range of 100 to 150 mg/kg/day.The order is for 600 mg in 75 mL D5W q6h.Determine whether the dosage ordered is within normal limits.What is your course of action? ______________________________

Question 31

Directions: Determine the normal dosage range to the nearest tenth.State your course of action.
A child weighs 10 kg and is to receive 0.5 g of nafcillin in 100 mL D5W q6h.The dosage range is 100 to 200 mg/kg/day.What is your course of action? ______________________________