[lil' girl]

1 g = 15 gr

so

3g = 45gr

[lil' girl]

To do proportion it would be 1g/15gr : 3g/xgr and cross multiply

1x=(3x15) 45 then divide by 1, 1 goes into 1 one time and 1 goes into 45 fortyfive times. Wa la your answer 45!

[lil' girl]

When you cross multiply you multiply 1 times x which is 1x and 3 times 15 which is 45. Does that clear it up?

Goes like this 1 over 15 and 3 over x if you write it down on paper it will make sense. If not I will try to explain better. Hope this helps

[lil' girl]

The only thing I can tell you is memorize, they gave us a list of measurements and I just memorized them. Of course sometimes I have to look back, but after a while it kind of sticks in your head. And are you asking grain i ss = mg? or gram? We use g for gram.

Anyhoo

1gr = 60 mg so to do the proportion it would be 1gr/60mg : 1.5gr/xmg

which would be 1x:90 and divide by 1 to get 90mg.

[lpnlpn]

Originally Posted by Love4Me

Not sure if this will make sense but this is how I would calculate it:

1 gram = 1000 mg therefore 3 grams = 3000 mg

gr 1 = 60 mg

(3000/60) = 50

So the answer would be 3 g = gr 50

Anyone feel free to correct me if I am wrong or if there is a better way of explaining it.

thank you! now i begin to calculate dosages, help i know one formula is d/h times q but how would i set this problem up---- on hand: v-cillin k 200,000 U per 5 ml----order reads v-cillin k 300,000 U p.o. ---give?

[lil' girl]

Originally Posted by lpnlpn

allright i think i have that but what are the equivalents for drams to grains ex. drams 8 = grains ______? thank you so much you are a lifesaver!!!!!

1 dram = 60gr so 8drams =480 grains

Did they not give you a list? If not I will post what I have if you would like.

[lil' girl]

Originally Posted by lpnlpn

thank you! now i begin to calculate dosages, help i know one formula is d/h times q but how would i set this problem up---- on hand: v-cillin k 200,000 U per 5 ml----order reads v-cillin k 300,000 U p.o. ---give?

Do it just like the others. You have 200,000 U per 5ml so

200,000/5ml : 300,000/xml

200,000x :1,500,000 and divide this by 200,000 = 7.5 ml

[lil' girl]

1 gram = 15 grains
1 grain = 60 mg
1 kg = 1000 g
1 g = 1000 mg
1mg = 1000 mcg
1 dram = 60 grain
1 kg = 2.2 lbs
5cc = 1 t
15 cc = 1/2 oz. = 1T
30cc = 1oz. = 2T
500cc = 16 oz. = 1pt.
1000cc = 32 oz = 1 qt.
1L = 1000ml
and of course cc=ml
and gtt=m (minim)
1cc = 15 minim = 15 gtt
1t = 60gtt = 60 minim = 1dram=5ml=5cc

If there are any others you need that I didn't post let me know

[lil' girl]

That ones easy, you know that 1 gr = 60 mg so just divide sixty by 8 and you get 7.5 so you will give 1 tablet.

[lpnlpn]

Originally Posted by lpnlpn

how do i know to divide and not multiply or something .. the lightbulbs not coming on with this one...i don't understand how to set the problem up to work it out... could you please simplify?

also don't mean to wear out my welcome but i am cramming and i have an i.v. problem that we haven't covered could you maybe walk me through it ...
order: Zinacef 750 mg. in 25 ml. i.v. fluid to infuse in 20 minutes
drop factor 60 gtts/ml