HELP PLS IM DESPERATE medication calculations

hi i have a test on monday and im stuck on these type of questions can u please help me... i need to see how to work it out so i can work others the same out ...?? pls
the question is mr. simons, an insulin dependant diabetic requires sliding scale insulin postoperatively. calculate the amount to be drawn up for each b.s.l range. stock strengh is 100 units per ml
i) bsl below 6.2mmol/l = 0 insulin
ii) bsl 6.3  10mmol/l give 12 units=__________ml
iii) bsl 12.1  15mmol/l give 18 units= ________ml
iv) bsl 18.1mmol/l and over give 25 units= ____ml
pls help i have no idea
what is mmol as well??
for i) tried and got
no. of units req = 6.2mmol
no. of units stock srength= 100units/ml
volume in stock strength = 1ml
= 6.2mmolx1
100 units/ml
= 0.062ml ?? its wrong isnt it??
thanks for anyone who can help


Oct 18, '07I think what's messing you up is that for #1, no insulin is required at all. For #2, if you plug 12 units into your formula in place of the 6.2 mmol, you should be on the right track.
(Remember that mmol is the unit that you'll see for your patient's blood sugar, but you won't give mmol of insulin, so put that aside.) 
Oct 18, '07using the advice u have given me for question ii)
the answer i got this time is
12units x 1ml
100units/ml
= 0.12ml ? i think this is still wrong is it not??
do i need to take into the equation the changing bsl??
as i said in need of serious help here!!
i need to get 100% in this test im stressing to the max!!!
the question is mr. simons, an insulin dependant diabetic requires sliding scale insulin postoperatively. calculate the amount to be drawn up for each b.s.l range. stock strengh is 100 units per ml
i) bsl below 6.2mmol/l = 0 insulin
ii) bsl 6.3  10mmol/l give 12 units=__________ml
iii) bsl 12.1  15mmol/l give 18 units= ________ml
iv) bsl 18.1mmol/l and over give 25 units= ____ml 
Oct 18, '07Think about this for a minute.
An easy formula to use is:
what you want x volume
what you've got
So for no. 1:
0 units x 1ml = 0mL
100units
no. 2:
12 units x 1mL = 12/100 = 0.12mL
100units
You try and work out the rest...
The mmols are a range that help guide you as to the amount of insulin you are to give. Say your patient's BSL was 7.2mmol. That comes between the BSL range of 6.3 and 10 mmol. The guideline is that if it is between that range that you would give 12 units. (ii). And you have calculated that 12 units = 0.12 mL. So you give 0.12mL
By calculating i, ii, iii, iv, and v you will get a volume for each of these ranges. So that is why it is important to calculate these first, so that when it comes to administration based on someones BSL you will know how much to give.Last edit by nyapa on Oct 18, '07 
Oct 18, '07THANKYOU THANKYOU THANKYOU
I was so blind, I didnt have any idea what the mmols meant so that was leading me astray.
THe answers i got were
3. 18units/100 units = 0.18mL
4. 25units/100 units = 0.25mL
do they sound correct to u? 
Oct 18, '07Sounds good to me! It's hard when you are really stressed out, and you can't see the wood for the trees so to speak, yeah?

Oct 18, '07Thanks so much... I think you just saved me from failling that bit of my test. As i have to get 100%
You have no idea how happy i am lol 
Oct 18, '07these are very simply solved by using the formula dose desired divided by dose on hand equals the amount to give. the information about the patient's bsl given in mmol/l is information that is not essential to performing the calculations.
the question is mr. simons, an insulin dependant diabetic requires sliding scale insulin postoperatively. calculate the amount to be drawn up for each b.s.l range. stock strength is 100 units per ml
i) bsl below 6.2mmol/l = 0 insulin
ii) bsl 6.3  10mmol/l give 12 units=__________ml
iii) bsl 12.1  15mmol/l give 18 units= ________ml
iv) bsl 18.1mmol/l and over give 25 units= ____ml
dose desired: 12 unitsfor bsl 12.1  15mmol/l give 18 units= ________ml:
dose on hand: 100 units/ml
so, dose desired/dose on hand gives you this equation to solve:
12 units (dose desired)/100 units/1 ml (dose on hand) = 12 units/1 x 1 ml/100 units = 0.12 ml
dose desired: 18 unitsfor bsl 18.1mmol/l and over give 25 units= ____ml:
dose on hand: 100 units/ml
so, dose desired/dose on hand gives you this equation to solve:
18 units (dose desired)/100 units/1 ml (dose on hand) = 18 units/1 x 1 ml/100 units = 0.18 ml
dose desired: 25 unitsif you have trouble working with fractions, particularly complex fractions, as in this case, you can review the rules of working with fractions on these websites:
dose on hand: 100 units/ml
so, dose desired/dose on hand gives you this equation to solve:
25 units (dose desired)/100 units/1 ml (dose on hand) = 25 units/1 x 1 ml/100 units = 0.25 ml
 http://www.mathleague.com/help/fract...mplexfractions  this web page has everything you want to know about fractions
 http://www.visualfractions.com/  visual fractions tutorials
 http://www.aaamath.com/fra.html#topic26  tutorials on working with fractions
for bsl 6.3  10mmol/l give 12 units=__________ml:
12 units/x ml = 100 units/1 ml
cross multiply to get 100x = 12, x = 12/100, x = 0.12 with the label of "ml". 
Oct 18, '07I am told that ALL dosage calculations can be solved by dimensional analysis. Get a good workbook & practice 15 minutes every day. Also see if your school has a nursing tutor that is willing to work with you on these.
We were taught to use this formula:
[FONT="Arial Black"] need = order x available
So for example, in your problem you needed the answer to be in mL per dose.
mL = 12 Units x 1mL
dose dose 100 units
The last part is the conversion factor that allows you to do the problem. If you need the list of conversions, pm me & I'll be happy to send them to you. They are something that just has to be memorized no way around it. The first thing I do when I get my tests is flip my paper over & write the whole list on the back. That way if I get flustered & can't remember a conversion, they are all right there in front of me. And I always do the math first. Doing so allows me to not be hurrying at the last minute to work a problem. If I have to guess at something b/c I"m running out of time I'd rather it be a multiple choice question than a math problem.
Good luck!! I just passed my second year proficiency exam with a 100% (and I would not call myself a math whiz by any stretch of the imagination) so it can be done. :spin: 
Oct 18, '07I can not thank everyone who has posted me enough for ur help
I was stressing out so much on that and in the end it turned out to be so simple lol
thanks so much