Question

Dosage Calculation

1. The label reads Heparin Sodium 10,000 USP Units/mL. The order is for Heparin 6,000 units q6hr sc. How many milliliters will you administer to this patient?

Answer: __________________

2. The order is to administer 600 mg of Ampicillin IM q8hr. The directions for dilution on the 2 gm vial read: Reconstitute with 4.8 mL sterile water to obtain a concentration of 400 mg/mL. How many mL will you administer per dose?

Answer: ____________________

3. The order is to administer Zofran 8 mg po three times per day. You have available: Zofran in a 100 mL bottle labeled 4 mg/tsp. How many mL will you administer for each dose?

Answer: ____________________

4. The order is to infuse Lactated Ringers at 125 mL/hour. The IV tubing has a drip factor of 15 drops/mL. What is the drops per minute flow rate?

Answer: ______________________

5. The order is to infuse one liter of normal saline over 24 hours. The IV is hung with microdrip tubing. What is the drip rate?

Answer: ______________________

6. The order is to administer diazepam 2.5 mg IV. The registered nurse has asked you to check her calculations for the correct volume of the diazepam. She shows you the vial, which reads: Diazepam 10 mg/2 mL. You complete your calculations and inform the registered nurse that she should administer how many mL?

Answer: ______________________

7. The physician has ordered the administration of meperidine 50 mg IM now. Available is meperidine 100 mg/mL. How many mL would you administer?

Answer: ______________________

8. Acetaminophen elixir 325 mg po now is ordered. The label on the available bottle of acetaminophen reads: acetaminophen 650 mg/10 mL. How many mL would you administer?

Answer: _______________________

9. Solumedrol 80 mg now is ordered. Label on the available solumedrol vial reads: solumedrol 125 mg/2 mL. How many mL would you administer?

Answer: _______________________

10. The physician has ordered Tobramycin 75 mg IVPB every 8 hours. The available Tobramycin has the following information attached to the vial:

For a FINAL concentration of:	Add sterile NS:
10 mg/mL	30 mL
50 mg/mL	6 mL
100 mg/mL	3 mL
Stable for 48 hours at room temperature or 7 days in the refrigerator. Read the accompanying circular.

How many mL of NS would you choose to use to mix the dose (choose only one answer)?

Answer: _______________________

Based on the concentration that you mixed, how many mL of Tobramycin is equal to one dose as ordered by the physician?

Answer: _______________________

11. The physician’s order reads: Oxacillin 30 mg IVPB q6hr. The patient weighs 95.5 lbs. The nursing drug guide recommends a maximum of 5 – 7.5 mg/kg/dose.

What is the maximum safe dose of Oxacillin for this patient?

Answer: _______________________

Is the dose ordered by the physician a safe dose? Show exactly how you came to this determination.

Answer: _________________________

12. One liter of D₅W to run over 10 hours. After 4 hours, there are 400 mL remaining in the IV bag.

Is the IV ahead or behind? Show all work to document how you made this determination.

Answer: ___________________________

If the IV is either ahead or behind, calculate the new flow rate (mL/hr) in order to finish the infusion on time. If the IV is on time, indicate the current flow rate (mL/hr).

Answer: ___________________________

13. The order is for 1000 mL of IV solution to be infused at 125 mL/hour. This infusion will need to infuse for ___ hrs. to complete on time at the ordered rate.

Answer: ______________________________

14. The order is Rocephin 500 mg every 8 hours. The infant weighs 15.4 lbs. The medication label shows that 75 – 150 mg/kg/day is the appropriate dosage range. As ordered, how many mg/day will the infant receive? Is this within the normal range?

Answer: Amt received/day: ___________________       Within normal range: ______________

15. Order: KayCiel 30 mEq PO BID pc. Available: KayCiel 45 mEq/15 mL. How many mL of KayCiel should you administer?

Answer: __________________________

16. The order is for Penicillin G 1.2 million units IM daily. Available: Penicillin G 9,000,000 units/1 mL. How many mL will you administer?

Answer: ___________________________

 

Answer 1

1.The label reads Heparin Sodium 10,000 USP Units/mL. The order is for Heparin 6,000 units q6hr sc. How many milliliters will you administer to this patient?

Answer: _____0.6ml_____________

The formula for the required quantity is what we want / what we have x concentration

Here what we want is 6000 units and what we have is 10000units in 1ml of solution .So when we put the value in the formula it will be 6000 /10000 x 1 = 0.6ml

2.The order is to administer 600 mg of Ampicillin IM q8hr. The directions for dilution on the 2 gm vial read: Reconstitute with 4.8 mL sterile water to obtain a concentration of 400 mg/mL. How many mL will you administer per dose?

Answer: _____1.5ml_______________

The formula for the required quantity is what we want / what we have x concentration

Here what we want is 600mg 8th hourly,what we have is as per the question 400ml in 1ml of solution. So when we put the values in the equation it will become 600 / 400 x 1 = 1.5ml

3 The order is to administer Zofran 8 mg po three times per day. You have available: Zofran in a 100 mL bottle labeled 4 mg/tsp. How many mL will you administer for each dose?

Answer: ______9.84ml______________

.The required dose is 8mg three times a day

It is given that in 100ml of bottle 4mg /teaspoon

one teaspoon is 4.92ml so for 8mg we have to take two teaspoon that means 2 x 4.92 = 9.84ml

4.The order is to infuse Lactated Ringers at 125 mL/hour. The IV tubing has a drip factor of 15 drops/mL. What is the drops per minute flow rate?

Answer: __________31.25 DROPS PER MINUTE____________

.The formula to find out the drops per minute is the total volume / time in minute x the drop factor

Here the given volume is 125 ml in 1 hour and the drop factor is 15 drops per ml

so the drops per minute flow rate is (125 / 1 x 60 ) x 15 = 31.25 drops per minute

5. The order is to infuse one liter of normal saline over 24 hours. The IV is hung with microdrip tubing. What is the drip rate?

Answer: _______41.66ml/hr_______________

The formula to find the drip rate is total volume / time in minute x the drop factor

here the total volume is 1liter that means 1000ml.It is mentioned in the question that the fluid is connected to a microdrip and the drop factor for micro drip is 60 gtt/ml

when weput all the value in the formula (1000 / 24 x 60) x 60 = 41.66ml/hr

6. The formula for the required quantity is what we want / what we have x concentration

Here the dose what we want is 2.5mg .Available dose is 10mg / 2 ml

so when w put the values in the equation we get (2.5 / 10) x 2 = 0.5 ml

. 7. The formula for the required quantity is what we want / what we have x concentration

Here the dose what we want is 50mg .Available dose is 100mg / ml

so when w put the values in the equation we get (50 / 100) x 1= 0.5 ml

8. The formula for the required quantity is what we want / what we have x concentration

Here the dose what we want is 325mg .Available dose is 650mg / 10 ml

so when w put the values in the equation we get (325 / 650) x 10= 5 ml

9. The formula for the required quantity is what we want / what we have x concentration

Here the dose what we want is 80mg .Available dose is 125mg / 2ml

so when w put the values in the equation we get (80 / 125) x 2= 1.28 ml

10 I will choose 3ml dilution. so we get 100mg / ml that means 300mg in 3ml

The ml to be taken to give one dose is

The formula for the required quantity is what we want / what we have x concentration

Here the dose what we want is 75mg .Available dose is 100mg / ml as per the stability mentioned in the label.

so when w put the values in the equation we get (75 / 100) x 1= 0.75 ml

It is said that it has stability of 48 hours in the room temperature .For the next 48 hours we need to give injections 6 times so we have to draw 6 x 0.75 ml = 4.5ml

SO the remaing dose can be administered without wasting within 48 hours

11. The recommended maximum dose is 5 - 7.5 mg /kg/dose

Patient weight is 95.5lbs ( 43.31 kg)

so when we calculate the safe dosage 5 x 43.31 - 7.5 x 43 .31 =216.55mg - 324.825 mg

12. Doctors advice is to give 30mg 6th hourly this is safe dose as the safe recommended dose is 216.55 mg - 324.825mg

13.We can say the infusion is going ahead.It not on time

To transfuse 1000ml of D5W over 10 hours per hour the infusion rate should be 1000 / 10 =100ml per hour

So in 4 hours 4 x 100 = 400 ml should go.After 4 hours 1000 - 400 = 600 ml should be there.Since there is only 400 ml we can say that the infusion is going ahead.

Now we have the total quantity is 400ml (the remaining fluid) and the time is 6 hours ( the remaining time)

That means we have to complete 400 ml in 6 hours

to find out the ml per hour we need to devide the total volume by the total time that is 400 / 6 = 66.66ml / hr

14.The formula to calculate the time needed to infuse the fluid is total volume of the fluid / the fluid to be administred in an hour

Here the total volume of the fluid is 1000ml and the rate of infusion is 125 ml / hr

so the time needed to infuse this is 1000 / 125 = 8 hours

15 The normal range of dose per day is 75 - 150 mg / kg/day

The body weight of the baby is 15.4 lbs (6.98 kg )

So the safe dose is 6.98 x 75 - 6.98 x 150 = 523.5mg - 1047 mg

Doctors advice is 500mg 8th hourly that means 500 mg three times a day .So in a day baby will receive 500 x 3 = 1500 mg which is not the safe recommended dose as it goes beyond the safe recommended daily dose.

16. The formula for the required quantity is what we want / what we have x concentration

Here the dose what we want is 30meq .Available dose is 40meq / 15ml

so when w put the values in the equation we get (30 / 40) x 15= 11.25 ml