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.) - ANS-2.2 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 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.) - ANS-16 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
A nurse is preparing to administer erythromycin ethyl succinate 50 mg/kg/day PO
divided in equal doses every 6 hr to a toddler who weighs 32 lb. Available is
erythromycin ethylsuccinate suspension 200mg/5ml. How many ml 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.) - ANS-2.2 lb/kg x 32 lb = 14.545454 kg
50 mg/kg x 14.545454 kg = 727.272727 mg
727.272727 mg / 4 (Q6H) = 181.818181 mg
200 mg/5ml x 181.818181 mg = 4.545454 mL
ANS: 4.5 ml
A nurse is preparing to administer gentamicin to a client who weighs 165 lb. The
medication reference recommends administering 2 mg/kg IM every 8 hr. How many mg
should the nurse plan to administer per dose?
(Round to the nearest whole number.) - ANS-2.2 lb/kg x 165 lb = 75 kg
2 mg/kg x 75 kg = 150 mg
ANS: 150 mg
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.) - ANS-2.2 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.) - ANS-2.2 lb/kg x 22 lb = 20 kg
7 mg/kg x 20 kg = 140 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.) - ANS-2.2 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 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.) - ANS-16 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
A nurse is preparing to administer erythromycin ethyl succinate 50 mg/kg/day PO
divided in equal doses every 6 hr to a toddler who weighs 32 lb. Available is
erythromycin ethylsuccinate suspension 200mg/5ml. How many ml 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.) - ANS-2.2 lb/kg x 32 lb = 14.545454 kg
50 mg/kg x 14.545454 kg = 727.272727 mg
727.272727 mg / 4 (Q6H) = 181.818181 mg
200 mg/5ml x 181.818181 mg = 4.545454 mL
ANS: 4.5 ml
A nurse is preparing to administer gentamicin to a client who weighs 165 lb. The
medication reference recommends administering 2 mg/kg IM every 8 hr. How many mg
should the nurse plan to administer per dose?
(Round to the nearest whole number.) - ANS-2.2 lb/kg x 165 lb = 75 kg
2 mg/kg x 75 kg = 150 mg
ANS: 150 mg
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.) - ANS-2.2 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.) - ANS-2.2 lb/kg x 22 lb = 20 kg
7 mg/kg x 20 kg = 140 mg
