WGU HESI Med-Surg Exam – Medication Administration &
DosageCalculations
Questions and Correct Answers with
-by-Step
Step
Solutions
WGU Hesi Med Surg
Question 1:
Penicillin G procaine 240,000 units intramuscularly is prescribed for a 4-year-old child
who has a streptococcal respiratory infection. The medication vial is labeled 1,200,000
units/2 mL. How many mL should the nurse administer?
(Enter numeric value only. If rounding is required, round to the nearest tenth.)
Explanation
Correct Answer (mL) : 0.4
Solution
To find the answer, we can use the following formula:
(mL to be administered) = (units prescribed) / (units per mL)
Substituting the given values, we get:
(mL to be administered) = (240,000) / (1,200,)
Simplifying, we get:
(mL to be administered) = (240,000 x 2) / (1,200,000)
(mL to be administered) = 480,,200,000
(mL to be administered) = 0.4
Therefore, the nurse should administer 0.4 mL of penicillin G procaine to the child.
, Question 2:
A 4-year-old is admitted with croup and receives a prescription for a single dose of
dexamethasone 0.6 mg/kg IM. The child weighs 35 pounds. How many mg should the
nurse administer? (Enter numerical value only. If rounding is required, round to the
nearest whole number.)
Explanation
Correct Answer (mg) : 10
Solution
, To find the answer, we can use the following steps:
- Convert the child's weight from pounds to kilograms by dividing by 2.2
- Multiply the weight in kilograms by the dosage in mg/kg
- Round the result to the nearest whole number
Using these steps, we get:
- (weight in kg) = (35) / (2.2) = 15.909
- (dose in mg) = (0.6) x (15.909) = 9.545
- (rounded dose in mg) = 10
Therefore, the nurse should administer 10 mg of dexamethasone to the child.
Question 3:
A patient is receiving a secondary infusion of vancomycin 1,500 mg in 250 mL to be
infused over two hours. The IV administration set delivers 10 gtt/mL. How many gtt/min
should the nurse regulate the infusion? (Enter numerical value only. If rounding is
required, round to the nearest whole number.)
Explanation
Correct Answer ( gtt\/min) : 21
Solution
To find the answer, we can use the following formula:
(gtt/min) = (mL/hour) x (gtt/mL) / 60
Substituting the given values, we get:
(gtt/min) = () x (10) / 60
Simplifying, we get:
(gtt/min) = 125 x
(gtt/min) =
(gtt/min) = 20.833
, (rounded gtt/min) = 21
Therefore, the nurse should regulate the infusion at 21 gtt/min.
Question 4:
A patient receives a prescription for warfarin 2 mg IM daily. The pharmacy
delivers a vial labeled, warfarin 5 mg/single-use vial. The instructions read,
reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL. How many
mL should the nurse administer?
(Enter the numerical value only.)
Explanation
Correct Answer (mL) : 1
Solution
First, we need to find out how many mg of warfarin are in one vial. Since the vial is
labeled 5 mg/single-use, we can assume that it contains 5 mg of warfarin.
Next, we need to find out how many mL of solution are in one vial. Since the instructions
say to reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL, we can use
the following formula:
Amount of solution= amount of water + amount of warfarin
Substituting the given values, we get:
Amount of solution = 2.7 + 5 =7.7 mL
Now, we need to find out how many mL of solution contain 2 mg of warfarin, which is
the prescribed dose for the patient. We can use the following formula:
mL of solution = mg of warfarin/ concentration of warfarin
Substituting the given values, we get:
mL of solution = 2/2 = 1 mL
Therefore, the nurse should administer 1 mL of solution to the patient.
Question 5:
DosageCalculations
Questions and Correct Answers with
-by-Step
Step
Solutions
WGU Hesi Med Surg
Question 1:
Penicillin G procaine 240,000 units intramuscularly is prescribed for a 4-year-old child
who has a streptococcal respiratory infection. The medication vial is labeled 1,200,000
units/2 mL. How many mL should the nurse administer?
(Enter numeric value only. If rounding is required, round to the nearest tenth.)
Explanation
Correct Answer (mL) : 0.4
Solution
To find the answer, we can use the following formula:
(mL to be administered) = (units prescribed) / (units per mL)
Substituting the given values, we get:
(mL to be administered) = (240,000) / (1,200,)
Simplifying, we get:
(mL to be administered) = (240,000 x 2) / (1,200,000)
(mL to be administered) = 480,,200,000
(mL to be administered) = 0.4
Therefore, the nurse should administer 0.4 mL of penicillin G procaine to the child.
, Question 2:
A 4-year-old is admitted with croup and receives a prescription for a single dose of
dexamethasone 0.6 mg/kg IM. The child weighs 35 pounds. How many mg should the
nurse administer? (Enter numerical value only. If rounding is required, round to the
nearest whole number.)
Explanation
Correct Answer (mg) : 10
Solution
, To find the answer, we can use the following steps:
- Convert the child's weight from pounds to kilograms by dividing by 2.2
- Multiply the weight in kilograms by the dosage in mg/kg
- Round the result to the nearest whole number
Using these steps, we get:
- (weight in kg) = (35) / (2.2) = 15.909
- (dose in mg) = (0.6) x (15.909) = 9.545
- (rounded dose in mg) = 10
Therefore, the nurse should administer 10 mg of dexamethasone to the child.
Question 3:
A patient is receiving a secondary infusion of vancomycin 1,500 mg in 250 mL to be
infused over two hours. The IV administration set delivers 10 gtt/mL. How many gtt/min
should the nurse regulate the infusion? (Enter numerical value only. If rounding is
required, round to the nearest whole number.)
Explanation
Correct Answer ( gtt\/min) : 21
Solution
To find the answer, we can use the following formula:
(gtt/min) = (mL/hour) x (gtt/mL) / 60
Substituting the given values, we get:
(gtt/min) = () x (10) / 60
Simplifying, we get:
(gtt/min) = 125 x
(gtt/min) =
(gtt/min) = 20.833
, (rounded gtt/min) = 21
Therefore, the nurse should regulate the infusion at 21 gtt/min.
Question 4:
A patient receives a prescription for warfarin 2 mg IM daily. The pharmacy
delivers a vial labeled, warfarin 5 mg/single-use vial. The instructions read,
reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL. How many
mL should the nurse administer?
(Enter the numerical value only.)
Explanation
Correct Answer (mL) : 1
Solution
First, we need to find out how many mg of warfarin are in one vial. Since the vial is
labeled 5 mg/single-use, we can assume that it contains 5 mg of warfarin.
Next, we need to find out how many mL of solution are in one vial. Since the instructions
say to reconstitute with 2.7 mL of sterile water for injection to yield 2 mg/mL, we can use
the following formula:
Amount of solution= amount of water + amount of warfarin
Substituting the given values, we get:
Amount of solution = 2.7 + 5 =7.7 mL
Now, we need to find out how many mL of solution contain 2 mg of warfarin, which is
the prescribed dose for the patient. We can use the following formula:
mL of solution = mg of warfarin/ concentration of warfarin
Substituting the given values, we get:
mL of solution = 2/2 = 1 mL
Therefore, the nurse should administer 1 mL of solution to the patient.
Question 5:
