Detailed Answer Key

ATI Math Remediation #1

Created on:09/19/2019 Page 1

1.A nurse is caring for a 1-month-old infant who weighs 3500 g and is prescribed a dose of cephazolin 50 mg/kg by

intermittent IV bolus three times daily. How many mg should the nurse administer per dose? (Round the answer to

the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

175 mg

Correct Rationale: Convert gm to kg:

STEP 1: What is the unity of measurement to calculate? Kg

STEP 2: Set up the equation and solve for X.

1000 gm/1 kg = client's weight in gm/X kg

1000 gm/1 kg = 3500 g/X kg

X = 3.54 kg

STEP 3: Round, if necessary.

STEP 4: Reassess to determine whether the conversion to kg makes sense. If 1000 gm =

1 kg, it makes sense that 3500 gm = 3.5 kg.

Calculate Dose:

STEP 1: What is the unit of measurement to calculate? mg

STEP 2: Set up the equation and solve for X.

mg x kg/dose = X

50 mg x 3.5 kg = 175 mg

STEP 3: Round, if necessary.

STEP 4: Reassess to determine whether the amount to administer makes sense. If the

provider prescribed 50 mg/kg/dose and the client weighs 3.5 kg, it makes sense to

administer 175 mg per dose. The nurse should administer cephazolin 175 mg by

intermittent IV bolus 3 times daily.

InCorrect Rationale: Convert gm to kg:

STEP 1: What is the unity of measurement to calculate? Kg

STEP 2: Set up the equation and solve for X.

1000 gm/1 kg = client's weight in gm/X kg

1000 gm/1 kg = 3500 g/X kg

X = 3.54 kg

STEP 3: Round, if necessary.

Detailed Answer Key

ATI Math Remediation #1

Created on:09/19/2019 Page 2

STEP 4: Reassess to determine whether the conversion to kg makes sense. If 1000 gm

= 1 kg, it makes sense that 3500 gm = 3.5 kg.

Calculate Dose:

STEP 1: What is the unit of measurement to calculate? mg

STEP 2: Set up the equation and solve for X.

mg x kg/dose = X

50 mg x 3.5 kg = 175 mg

STEP 3: Round, if necessary.

STEP 4: Reassess to determine whether the amount to administer makes sense. If the

provider prescribed 50 mg/kg/dose and the client weighs 3.5 kg, it makes sense to

administer 175 mg per dose. The nurse should administer cephazolin 175 mg by

intermittent IV bolus 3 times daily.

2.A nurse is caring for an adolescent client who has pneumonia and a prescription for cefpodoxime 5 mg/kg PO every

12 hr for 5 days. The client weighs 88 lb. How many mg should the nurse administer per dose? (Round the answer

to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

200 mg

Correct Rationale: Convert lb to kg:STEP 1: What is the unit of measurement to calculate? kg

STEP 2: Set up the equation and solve for X.

2.2 lb/1 kg = client's weight in lb/X kg

2.2 lb/1 kg = 88 lb/X kg

X = 40

STEP 3: Round, if necessary.

STEP 4: Reassess to determine whether the conversion to kg makes sense. If 2.2 lb = 1

kg, it makes sense that 88 lb = 40 kg.

Calculate Dose:

STEP 1: What is the unit of measurement to calculate? mg

STEP 2: Set up the equation and solve for X.

mg x kg/dose = X

5 mg x 40 kg = 200 mg

STEP 3: Round, if necessary.

STEP 4: Reassess to determine whether the amount to administer makes sense. If the

provider prescribed cefpodoxime 5 mg/kg/dose and the client weighs 40 kg, it makes

sense to administer 200 mg per dose. The nurse should administer cefpodoxime 200 mg

PO every 12 hr.

InCorrect Rationale: Convert lb to kg:STEP 1: What is the unit of measurement to calculate? kg

STEP 2: Set up the equation and solve for X.

2.2 lb/1 kg = client's weight in lb/X kg

2.2 lb/1 kg = 88 lb/X kg