Re: few more math problem

[Guest guest]

Mileth I have to go now I will be back on late tonight. But I amsure

someone will help you.

Go to the tutorials in the file section almost every thing is there.

here are a couple of how to's:

1)If the Pharmacy pays 56.70 for a cartoon of 48 Fleet enema kits

and sell them at a markup of 50% , what is the retail price.

multiply cost by 1.5 that is price for all 48. If the answer is per

each then divide that by 48.

2)What amount of a 16 mg/ML solution is needed to make a 120 ML

bottle of 0.8 mg/ml solution?

3)What volume of 5% sodium hypochlorite is required to prepare 1 L

of 0.1% sodium hypochlorite disinfecting solution?

Use the Alligation Tutorial I found in the file section. Remember to

use water to dilute and that water does not have medication.

Answer should be:

20 ml of the 5% Hypochlorite

and

980 ml of the Water.

Makes one liet of the 0.1% Hypochlorite sol

4)A 32 lb patient requires aminophylline 1V at 1 mg/kg/hr.The

solution is prepared using premixed aminophylline 400 mg in 500 cc

D5W. What will be the correct rate?

Use the Tutorial on IV Flow rates fundin the file section

Start with the conversion of the pts wt to KG divide by 2.2Kg/lb

14.55 KG

1mg per every Kg = 14.55 mg of drug

Then set up a ratio with that number of mg, to 400mg/500ml to get ml

per hour.

400mg/500ml = 14.55 mg/ Xml

X ml + ?

5)A total parental nutrition (TPN) order that includes folic acid

2mg/L is filled using a stock vial that delivers 5mg/ml. What volume

of injection will be used to prepare a 2500 ML TPN bag?

set 2mg/L = X mg /2.5 L

X = 5mg

Then set this equal to the Availability.

5/mg/ml = 5mg/Xml

X = 1 ml

Sorry that this is not my usual detailed stuff, but like I said I

have to leave for my other job now!

Jeanetta

> Thank you very much for your time. I tried my best to answer but it

> makes me crazy.

>

> Mileth

[Guest guest]

Dear Mileth,

Here is some more detail that I promised you. I wish I could have

been back late last night, but I could not.

Go to the tutorials in the file section almost every thing is there.

Here are a couple of how to's:

1)If the Pharmacy pays 56.70 for a cartoon of 48 Fleet enema kits

and sell them at a markup of 50% , what is the retail price.

Multiply cost by 1.5 that is price for all 48. If the answer is per

each then divide that by 48.

1.5 x 56.7 = $85.05 for one carton of all 48 Fleet enema kits

But each enema kit costs = $1.77 ( 85.05 divided by 48)

2)What amount of a 16 mg/ML solution is needed to make a 120 ML

bottle of 0.8 mg/ml solution?

Remember the word `of' between two numbers means multiply.

Here the units of ml cancel out:

120ml of 0.08mg/ml = 120ml x 0.08mg/ml = 9.6 mg are in the final

solution.

The strength of the stock is 16mg /ML

So setting these equal to each other will help to find out how much

of the stock solution will have 9.6mg or how much you will need.

16mg/1ml = 9.6mg/Xml

Cross Multiply

1ml x 9.6mg/ 16mg = X ml = 0.6 ml

0.6 ml of stock solution will be needed to make the 120 ml of the

0.08 mg/ml solution

How much water is needed?

120 ml – 0.6 ml = 119.4 ml of water will be added to the 0.6 ml (that

contains 9.6mg of drug)

This will total 120 ml with 9.6 mg of drug. 9.6mg/120ml = 0.08mg/ml

3)What volume of 5% sodium hypochlorite is required to prepare 1 L

of 0.1% sodium hypochlorite disinfecting solution?

Use the Allegation Tutorial I found in the file section. Remember to

use water to dilute and that water does not have medication.

Answer should be:

20 ml of the 5% Hypochlorite

and

980 ml of the Water.

Makes one liter of the 0.1% Hypochlorite sol

Alternatively:

1 Liter of 0.1% = 1000ml X 0.1gram/100 ml = 1 gram

Where will that 1 gram of drug come from? From the 5% solution

5% = 5 gm /100ml

5gm/100 = 1 gm /Xml= 20 ml

So there is 1 gram of hypochlorite in 20 ml of the 5% solution.

Now lets dilute it!

1000ml of solution – 20 ml (1gram hypochlorite) = 980 ml of water

4)A 32 lb patient requires aminophylline IV at 1 mg/kg/hr.The

solution is prepared using premixed aminophylline 400 mg in 500 cc

D5W. What will be the correct rate?

Use the Tutorial on IV Flow rates fund in the file section

Start with the conversion of the pts wt to KG divide by 2.2Kg/lb =

14.55 KG

1mg/1kg = 14.55mg/X Kg

1mg per every Kg = 14.55 mg of drug

Then set up a ratio with that number of mg, to 400mg/500ml to get

ml

per hour.

400mg/500ml = 14.55 mg/ Xml

500 x 14.55/400 = Xml

X ml = 18.125ml or 18.13 ml

1 mg/kg/hr = 14.55mg/hr or 18.13 ml/hr

Now let us take this problem one step further:

Let us suppose that the nurse has to set it up in drops per minute?

First the nurse would find the conversion factor or Drop Factor on

the piece of equipment. Let us say that it is 15 drop per ml, the

18.13ml/hr X 15 gtt/ml X 1 hr/60h min = 4.53 gtts/min

5)A total parental nutrition (TPN) order that includes folic acid

2mg/L is filled using a stock vial that delivers 5mg/ml. What

volume

of injection will be used to prepare a 2500 ML TPN bag?

If there is 2 mg for every 1 liter, then how many mg are there for

2.5 liters?

Set 2mg/L = X mg /2.5 L

X = 5mg

Then set this equal to the Availability.

5mg/1ml = 5mg/Xml

cross multiply:

1ml x 5mg / 5mg = X ml

X = 1 ml

Therefore 1 ml of stock Folic Acid of 5mg / 1ml is what is needed for

2.5 liters that would have 2mg for every liter of TPN. A TPN of 2.5

liters would need 5 mg Folic ACID, but 5mg is equal to 1 ml , so

only 1 ml of stock FA is needed.

I hope this helps you to know how you did on the exam as well as

teach you, even thought is came a bit late on the posts.

Respectfully,

Jeanetta Mastron CPhT BSChem

F/O

Copyrighted July25 and 26 , 2003