Hello all,I'm getting ready to start my second semester of nursing school of the 22th of this month. Eash semester we must take a calculations exam....I have always had problems when it came to problems with grains......I'm looking over my practice exam..and dont have a clue how to set up or do this grains problem....can someone show me how to set up grains problems..and how to solve them.My school uses the formula.....gr i = 60 mg or gr vx = 1000mg.Here is the problem.Order NTG gr 1/150 IV stat. Available: NTG 0.4 mg/ml. How many ml's will you give?Any help would be a blessing....Thanks all.

agldragonRN 1,547 Posts Specializes in Wound Care, LTC, Sub-Acute, Vents. Has 5 years experience. Jan 19, 2008 hello all,i'm getting ready to start my second semester of nursing school of the 22th of this month. eash semester we must take a calculations exam....i have always had problems when it came to problems with grains......i'm looking over my practice exam..and dont have a clue how to set up or do this grains problem....can someone show me how to set up grains problems..and how to solve them.my school uses the formula.....gr i = 60 mg or gr vx = 1000mg.here is the problem.order ntg gr 1/150 iv stat. available: ntg 0.4 mg/ml. how many ml's will you give?any help would be a blessing....thanks all.= (1/150) x (60 mg) (cancel the zero)= (1/15) x (6)=6/15=2/5=0.4 mg ( same as gr 1/150, the original order)then (0.4 mg / 0.4 mg) x 1 mlso, you would give 1 ml

CT Pixie, BSN, RN 3,723 Posts Has 10 years experience. Jan 19, 2008 = (1/150) x (60 mg)= (1/15) x (6)=6/15=2/5=0.4 mgthen (0.4mg / 0.4 mg) x 1 mlso, you would give 1 ml:yeahthat: your fingers were quicker than mine

bsugar888 168 Posts Specializes in psych,and detox,and Ltc. Jan 19, 2008 I tried 150 x 60 and I got 9000so what am I doing wrong.I see what you did But just dont get the hang on it....I feel so dump.Where is 1/15 x 6 coming from???

agldragonRN 1,547 Posts Specializes in Wound Care, LTC, Sub-Acute, Vents. Has 5 years experience. Jan 19, 2008 i tried 150 x 60 and i got 9000so what am i doing wrong.i see what you did but just dont get the hang on it....i feel so dump.where is 1/15 x 6 coming from???= 1 ... .. 60---- x -----150 ...... 1= (1 x 60)-----------(150 x 1)= 60 / 150= 6 / 15 ( i just cancelled the zero to make the number smaller)

CT Pixie, BSN, RN 3,723 Posts Has 10 years experience. Jan 19, 2008 think of it a sixty over 1 times 1 over 150..60 x 11 150you can reduce the 60 down to 5 (after you divide by 10) and 150 down to 15 (after you divide by 10)then it reads on 1 over 15 times 6 over 1 giving you 6 over 15. You can either reduce 6/15 to 2/5 or leave it the way it is. Either way, then divide the bottom number into the top and thats your conversion.. 0.4mg=1/150grains

bsugar888 168 Posts Specializes in psych,and detox,and Ltc. Jan 19, 2008 can I do this with all grains problems???....is so I think I got it:w00t: You guys make it sound soooo easy......thank you hats off to all.....

agldragonRN 1,547 Posts Specializes in Wound Care, LTC, Sub-Acute, Vents. Has 5 years experience. Jan 19, 2008 can i do this with all grains problems???....is so i think i got it:w00t: you guys make it sound soooo easy......thank you hats off to all.....yes, what ever the grain(s), you multiply it by 60 / 1 (sixty over one).and try to always reduce your number to a smaller one so that it would be easier to solve (if you are allowed to use a calculator then you don't have to).angel

CT Pixie, BSN, RN 3,723 Posts Has 10 years experience. Jan 19, 2008 Yup, do the exact same thing for any other grain conversion. Oh, a way our instructor had use memorize/remember grains to mg or vise versa was..draw a clock face..on the inside put the numbers like they'd correspond with the clock..for example put 15 where quarter after would be 30 where 1/2 hr would be 45 where quarter of would be and 60 where the hour would be..now on the outside next to the the 15 put 1/4 (quarter past the hour), at the 30 put 1/2 (half past the hour) at the 45 put 3/4 (three quarters of an hour) and at the 60 put 1 (hour). guess what you now have..yup the grain to milligram or milligram to grain conversions. look at the clock. 15mg is 1/4 grain, 30milligrams is 1/2 grain, 45mg is 3/4 grain and 60mg is 1 grain!Ever dose calc test I take, I immediately put the clock face down :)

bsugar888 168 Posts Specializes in psych,and detox,and Ltc. Jan 19, 2008 thanks sooooooo much...life seems so much easier now..... can now do grain problems.......THANK The LORD......I wish I knew it was that easier last semester.:w00t::w00t::w00t:

locolorenzo22, BSN, RN 1 Article; 2,396 Posts Specializes in Ortho, Neuro, Detox, Tele. Jan 19, 2008 ok, I have another way to do it...if you want to hear....Order NTG gr 1/150 IV stat. Available: NTG 0.4 mg/ml. How many ml's will you give?You know 1gr = 60mg.............so..... (1/150)= (60/150) = 0.4 mg x 1ml = 0.4 ml.....you take your dose desired 0.4mgOVER your dose on hand 0.4mgmultiply the whole thing by your volume 1mland you get your answer.....DD x ? ml = mg/ml......DOH