Dosage Calculation Help - ml/hr for heparin

I've done these before but for some reason I'm blanking out on how to complete this problem. I usually use dimensional analysis and I can't remember how to set it up.

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1. The order is to infuse 1000 units heparin per hour from an available solution strength of 25,000 units in 500 ml D5W. Calculate the ml/hr rate.

2. A solution of 25,000 units heparin in 500 ml D5W to infuse at a rate of 1200 units per hour. Calculate the ml/hr rate.

3. A 500 ml D5W with 20,000 units heparin infusing at 1000 units/hour. An order states to increase by 240 units/hour. What is the new rate? (do you just add the 240 to the original 1000 units?)

Thanks for any help!

[JLS29]

31ml/hr

[larryhaven]

one with the heparin drip I can only get 16 ml/hr

one with the 10 mg to be administer I can only get 2 what am I missing:no:

[Pepper The Cat, BSN, RN]

I can't see how you are getting 2 vials. Think about it. Each vial has 40mg in it. 2 vials would be 80 mg.

ok try this.

You need $10.00 and you find $40.00 in your wallet. How much of the $40.00 do you take? What percentage of the money in the wallet will you take out.

Same thing here. You need 10 mg, you have 40mg/ml. What percentage of that ml will you need.

Try this formula: x is the unknown that you need.

10mg /x ml= 40mg /1 ml

[nurseprnRN, BSN, RN]

Mine too, but probably not for the same reason.

People, look at the words in the problems. THINK. Imagine that instead of medication, which apparently freaks people out, that we're talking about, oh, Girl Scout cookies, because Juliette Lowe's birthday is today. I like the classic shortbreads, so we'll start with that , and isn't it too bad they don't come embossed with the merit badges anymore? Ahem.

You have the OK to give some kids ten cookies each. You have boxes of forty cookies per box on the shelf. How much of a box does each kid get? If you say, "Two boxes," you have just contributed to the national obesity epidemic and ruined the kid's supper with an eightfold cookie overdose to boot, because two boxes of cookies contain eighty cookies. You want one quarter of a box per kid, right? That's your ten cookies.

Draw pictures. That can really help you see where you are and where you need to be. Here's a box of 40 cookies. Look to see how many ten cookies is. More or less than one box? Circle those 10 cookies you are giving that kid.

Now see how that problem looks? You want to give 10mg, and it comes in 40mg/cc in the vial on the shelf. How much do you give? Here's 40 mg in a 1cc vial ... Circle the 10 mg you want to draw up.

[Tabitha Cumpian, MSN, RN]

As stated by a previous post: 

1. The order is to infuse 1000 units heparin per hour from an available solution strength of 25,000 units in 500 ml D5W. Calculate the ml/hr rate. 500ml\25000 x 1000\1 =20 ml\hr

2. A solution of 25,000 units heparin in 500 ml D5W to infuse at a rate of 1200 units per hour. Calculate the ml/hr rate. 500\25000 x 1200\1 = 24 ml\hr

3. A 500 ml D5W with 20,000 units heparin infusing at 1000 units/hour. An order states to increase by 240 units/hour. What is the new rate? (do you just add the 240 to the original 1000 units?) 1000 units to start, 240 units after the first hour = 1240 units\hr

I would simply add that for this last question, with an increase of 240 units/hr this will increase your infusion rate to 31ml/hr.