ATI Dosages by Weight Dosage
Calculation 3.0 Dosage by Weight
Test
A nurse is preparing to administer epoetin alfa 50 units/kg subcutaneous toa
preschooler who weighs 40 lb. Available is epoetin alfa 2,000 units/ml. How many ml
should the nurse administer?
(Round to the nearest whole number. Use a leading 0 if it applies. Don't use a
trailing zero.) - ANSWERS2.2 lb/kg = 40 lb -> 18.181818 kg
50 units/kg x 18.181818 kg = 909.090909 units
2,000 units/ml = 909.090909 units -> 0.454545ml
ANS: 0.45 ml
A nurse is preparing to administer phenytoin 15 mg/kg/day PO divided in three equal
doses to a client who weighs 120 lb. Available is phenytoin suspension 125 mg/5ml.
How many ml should the nurse administer per dose?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 120 lb = 54.545454 kg
15 mg/kg x 54.545454 kg = 818.18181 mg
818.18181 mg / 3 = 272.727272 mg
125 mg/5 ml x 272.727272 mg = 10.909090 ml
ANS: 10.9 ml
A nurse is preparing to administer cefdinir to a child who weighs 44 lb. The
medication reference recommends administering 7 mg/kg PO every 12 hr. How
many mg should the nurse plan to administer per dose?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 22 lb = 20 kg
7 mg/kg x 20 kg = 140 mg
ANS: 140 mg
A nurse is preparing to administer potassium gluconate 3 mEq/kg/day PO divided in
equal doses every 6 hr to a preschooler who weighs 42 lb. Available is potassium
gluconate liquid 20 mEq/15ml. How many ml should the nurse administer per dose?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 42 lb = 19.090909 kg
3 mEq/kg x 19.090909 kg = 57.272727 mEq
57.272727 mEq / 4(Q6H) = 14.318181 mEq
, 20 mEq/15 ml x 14.318181 mEq = 10.738636 ml
ANS: 11 ml
A nurse is preparing to administer ceftazidime 40 mg/kg IV bolus every 8 hr to a
toddler who weighs 22 lb. Available is ceftazidime injection 40 mg/ml. How many ml
should the nurse administer per dose?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 22 lb = 10 kg
40 mg/kg x 10 kg = 400 mg
40 mg/ml x 400 mg = 10 ml
ANS: 10 ml
A nurse is preparing to administer amikacin IM to a client who weighs 176 lb. The
medication reference states that the safe dosage range is 7.5 to 15 mg/kg/day
divided every 12 to 24 hr. What is the maximum safe dose the nurse should expect
to administer per day?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 176 lb = 80 kg
15 mg/kg x 80 kg = 1200 mg
ANS: 1200 mg
A nurse is caring for an infant who weighs 11 lb 4 oz. What is the infant's weight in
lb?
(Round to the nearest whole number.) - ANSWERS16 oz/lb x 4 oz = 0.25 lb
11 lb + 0.25 lb = 11.25 lb
ANS: 11.25 lb
A nurse is preparing to administer phenytoin 5 mg/kg/day PO divided equally every
12 hr for an infant who weighs 12 lb 4 oz. How many mg should the nurse administer
per dose?
(Round to the nearest whole number. Use a leading 0 if it applies. Don't use a
trailing zero.) - ANSWERS16 oz/lb x 4 oz = 0.25lb
12 lb + 0.25 lb = 12.25 lb
2.2 lb/kg x 12.25 lb = 5.568181 kg
5 mg/kg x 5.568181 kg = 27.840909 mg
27.840909 mg / 2(Q12H) = 13.920454 mg
ANS: 13.9 mg
Calculation 3.0 Dosage by Weight
Test
A nurse is preparing to administer epoetin alfa 50 units/kg subcutaneous toa
preschooler who weighs 40 lb. Available is epoetin alfa 2,000 units/ml. How many ml
should the nurse administer?
(Round to the nearest whole number. Use a leading 0 if it applies. Don't use a
trailing zero.) - ANSWERS2.2 lb/kg = 40 lb -> 18.181818 kg
50 units/kg x 18.181818 kg = 909.090909 units
2,000 units/ml = 909.090909 units -> 0.454545ml
ANS: 0.45 ml
A nurse is preparing to administer phenytoin 15 mg/kg/day PO divided in three equal
doses to a client who weighs 120 lb. Available is phenytoin suspension 125 mg/5ml.
How many ml should the nurse administer per dose?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 120 lb = 54.545454 kg
15 mg/kg x 54.545454 kg = 818.18181 mg
818.18181 mg / 3 = 272.727272 mg
125 mg/5 ml x 272.727272 mg = 10.909090 ml
ANS: 10.9 ml
A nurse is preparing to administer cefdinir to a child who weighs 44 lb. The
medication reference recommends administering 7 mg/kg PO every 12 hr. How
many mg should the nurse plan to administer per dose?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 22 lb = 20 kg
7 mg/kg x 20 kg = 140 mg
ANS: 140 mg
A nurse is preparing to administer potassium gluconate 3 mEq/kg/day PO divided in
equal doses every 6 hr to a preschooler who weighs 42 lb. Available is potassium
gluconate liquid 20 mEq/15ml. How many ml should the nurse administer per dose?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 42 lb = 19.090909 kg
3 mEq/kg x 19.090909 kg = 57.272727 mEq
57.272727 mEq / 4(Q6H) = 14.318181 mEq
, 20 mEq/15 ml x 14.318181 mEq = 10.738636 ml
ANS: 11 ml
A nurse is preparing to administer ceftazidime 40 mg/kg IV bolus every 8 hr to a
toddler who weighs 22 lb. Available is ceftazidime injection 40 mg/ml. How many ml
should the nurse administer per dose?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 22 lb = 10 kg
40 mg/kg x 10 kg = 400 mg
40 mg/ml x 400 mg = 10 ml
ANS: 10 ml
A nurse is preparing to administer amikacin IM to a client who weighs 176 lb. The
medication reference states that the safe dosage range is 7.5 to 15 mg/kg/day
divided every 12 to 24 hr. What is the maximum safe dose the nurse should expect
to administer per day?
(Round to the nearest whole number.) - ANSWERS2.2 lb/kg x 176 lb = 80 kg
15 mg/kg x 80 kg = 1200 mg
ANS: 1200 mg
A nurse is caring for an infant who weighs 11 lb 4 oz. What is the infant's weight in
lb?
(Round to the nearest whole number.) - ANSWERS16 oz/lb x 4 oz = 0.25 lb
11 lb + 0.25 lb = 11.25 lb
ANS: 11.25 lb
A nurse is preparing to administer phenytoin 5 mg/kg/day PO divided equally every
12 hr for an infant who weighs 12 lb 4 oz. How many mg should the nurse administer
per dose?
(Round to the nearest whole number. Use a leading 0 if it applies. Don't use a
trailing zero.) - ANSWERS16 oz/lb x 4 oz = 0.25lb
12 lb + 0.25 lb = 12.25 lb
2.2 lb/kg x 12.25 lb = 5.568181 kg
5 mg/kg x 5.568181 kg = 27.840909 mg
27.840909 mg / 2(Q12H) = 13.920454 mg
ANS: 13.9 mg
