Dosage calculations practice questions
exam
.
.
. 1. A client with cardiogenic shock weighs 220 lb and is receiving
dopamine at the rate of 3 mcg/kg/minute. The solution strength available is
dopamine 400 mg in 250 ml of D5W. The nurse should set the infusion pumpto
deliver how many ml/ho...
Dosage calculations practice questions
exam
.
.
. 1. A client with cardiogenic shock weighs 220 lb and is receiving
dopamine at the rate of 3 mcg/kg/minute. The solution strength available is
dopamine 400 mg in 250 ml of D5W. The nurse should set the infusion pump to
deliver how many ml/hour? (Enter numeric value only. If rounding is required,
round to the nearest tenth.)
. Correct Responses: "11.3"First, convert pounds to kg, 220 lb : X = 2.2 lb :
1 kg = 100 kg. Next, calculate the dosage per minute, 3 mcg/kg/min x 100 kg =
300 mcg/min. Convert mcg/min to mcg/hour, 300 mcg/min x 60 min=18,000
mcg/hour. Convert mcg/hr to mg/hour, 18,000 mcg/hr = 18.0 mg/hour. Calculate
the rate, 400 mg : 250 ml = 18 mg : X ml 400X = 4500 X =
11.25 = 11.3 ml. So, 18 mg/11.3 ml should be infused at 11.3 ml/hour.
.
. 2.A client with hypertension who weighs 72.4 kg is receiving an infusion
of nitroprusside (Nipride) 50 mg in D5W 250 ml at 75 ml/hour. How many
mcg/kg/minute is the client receiving? (Enter numeric value only. If rounding is
required, round to the nearest tenth.)
. Correct Responses: "3.5"Calculate the mg/hour infusing, 50 mg : 250 ml =
X : 75 ml 250X = 3750 and X = 15 mg/hour. Next, convert mg/hr to mcg/hour, 15
mg/hour = 1 mg / 1000 mcg = 15,000 mcg/hour, then divide by60 min = 250
mcg/minute. Lastly, 250 mcg/72.4 kg/min = 3.45 = 3.5 mcg/kg/minute.
.
. 3. A client who weighs 70 kg is receiving a dopamine solution of 800
mg/500 ml normal saline at 5 ml/hour. How many mcg/kg/minute is the client
receiving? (Enter numeric value only. If rounding is required, round to the nearest
tenth.)
. Correct Responses: "1.9"To change ml/hour to mcg/kg/minute, use the
formula: desired rate (5 ml/hour) / volume available (500 ml) x dose available
(800 mg) = 8 mg/hour. Next, convert milligrams/hour to mcg/kg/minute: mg
(8) x 1000 / kg (70) / 60 minutes = 1.904 = 1.9 mcg/kg/minute.stoluinDOCX
. The healthcare provider prescribes a continuous infusion of 5%
, dextrose in 0.45% sodium chloride at 85 ml/hour. The IV administration set
delivers 10 gtt/ml. The nurse should regulate the drop rate to deliver how many
gtts/minute? (Enter numeric value only. If rounding is required, round to the
nearest whole number.)
. Correct Responses: "14"Volume/Time (minutes) x drop factor
(gtt/ml) = 85 ml/ 60 minutes x 10 gtt/ml = 14.16 = 14 gtt/minute
4. A client is receiving an IV solution of sodium chloride 0.9% (Normal Saline) 250 ml
with amiodarone (Cordarone) 1 gram at 17 ml/hour. How many mg/minute of
amiodarone is infusing? (Enter numeric value only. If rounding is required, round
to the nearest tenth.)
. Correct Responses: "1.1, 1"Convert grams to mg, 1 gram equals 1,000 mg.
Using ratio and proportion - 1,000 mg : 250 ml :: X mg : 1ml 250X= 1,000 so X =
4 mg/ml is the solution concentration of amiodarone. The infusion rate (ml/hour) x
concentration (mg/ml) divided by 60 minutes/hour 17 ml/hour x 4 mg/ml = 68/60
= 1.13 = 1.1 mg/minute.
.
. 5. A client who weighs 176 pounds is receiving an IV infusion with
@bestsolutionsDOCX
, esmolol hydrochloride (Brevibloc) at 48 ml/hour. The IV solution is labeled with
the concentration of Brevibloc 10 mg/ml. How many mcg/kg/minute is the client
receiving? (Enter numeric value only.)
. Correct Responses: "100"Convert pounds to kg by dividing 176 pounds
by 2.2 pounds = 80 kg. Convert the IV concentration from mg to mcg. 1 mg :
1000 mcg :: 10 mg : 10,000 mcg. Infusion rate (48 ml/hour) x
concentration (10,000 mcg/ml) divided by 60 minutes/hour x 80 kg = 48 x
10,000 divided by 60 x 80 = 480, = 100 mcg/kg/minute.
.
. 6. The nurse is preparing the change-of-shift report for a client who has
a 265 ml secondary infusion that was started 2 hours ago at a rate of 85 ml/hour
via an infusion pump. The nurse should report that how many ml remain to be
infused by the on-coming nurse? (Enter numeric value only.)
. Correct Responses: "95"85 ml x 2 hours = 170 ml has infused. 265 ml
(total amount to be infused) - 170 ml (amount infused) = 95 ml remain to be
infused.
.
. 7.A male client receives a prescription for ondansetron hydrochloride
(Zofran) 4 mg IV to prevent postoperative nausea after an inguinal hernia repair.
The medication is available in 2 mg/ml. How many ml should the nurse
administer? (Enter numeric value only.)
. Correct Responses: "2"Use ratio and proportion, 4 mg : X ml = 2 mg : 1 ml
2X = 4 X = 2
.
. 8. The nurse is preparing to administer Hepatitis B Vaccine,
Recombinant (Energix-B) 5 mcg IM to a school-aged child. The vaccine is
labeled, 10 mcg/ml. How many ml should the nurse administer? (Enter
numeric value only. If rounding is required, round to the nearest tenth).
. Correct Responses: "0.5, 1"Use ratio and proportion, 5 mcg : X ml :: 10
mcg : 1ml 10X = 5 X = 0.5 ml
.
. 9. A client's daily PO prescription for aripiprazole (Abilify) is increased
from 15 mg to 30 mg. The medication is available in 15 mg tablets, and the client
already received one tablet today. How many additional tablets should the nurse
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