HELP PLS IM DESPERATE- medication calculations

  1. 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 post-operatively. 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
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  2. 9 Comments

  3. by   EricJRN
    I 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.)
  4. by   airyfairy
    using 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 post-operatively. 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
  5. by   nyapa
    Think 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
  6. by   airyfairy
    THANKYOU 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?
  7. by   nyapa
    Sounds 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?
  8. by   airyfairy
    Thanks 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
  9. by   Daytonite
    these 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 post-operatively. 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
    for bsl 6.3 - 10mmol/l give 12 units=__________ml:
    dose desired: 12 units
    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
    for bsl 12.1 - 15mmol/l give 18 units= ________ml:
    dose desired: 18 units
    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
    for bsl 18.1mmol/l and over give 25 units= ____ml:
    dose desired: 25 units
    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
    if 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:
    these can also be worked by ratios and finding the unknown variable, a simple algebra problem:
    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".
  10. by   SchoolRN,BSN
    I 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:
  11. by   airyfairy
    I 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

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