I start OB tomorrow and the math is freaking me out. Is there anywhere out there that shows me how to figure out lbs/oz to grams and kg and also percent loss of a newborn. example is baby lost 7% of birth weight of 3648 gm. How much do they now weigh in gr, kg, lbs. This math stuff always stresses me out and this is not anything I recall learning so far. Thanks!:uhoh21: 0 Share this post Link to post Share on other sites

May 20, 2007 by morte, LPN, LVN Are you a credible source? Add your Credentials, Experience, etc. 1 Follower; 6,978 Posts; 32,512 Profile Views 1000 grms=1 kg=2.2lbs 0 Share this post Link to post Share on other sites

May 20, 2007 by suzanne4, RN Are you a credible source? Add your Credentials, Experience, etc. 1 Follower; 26,410 Posts; 76,816 Profile Views This is the exact same math that you need to use for your medication calculations, just simple math/algebra will work. Nothing more is needed, not even a calculator if you do not have one with you. Take each problem and go thru it one step at a time. What is 7% of that weight that you listed? Subtract that from the number, and then convert that to pounds and ounces. 0 Share this post Link to post Share on other sites

May 20, 2007 by midcom Are you a credible source? Add your Credentials, Experience, etc. 428 Posts; 7,801 Profile Views The percentage part is easy. Subtract the % change (in this case 7) from 100 = 93 Multiply the original weight by .93 3648 X .93= 3392.7 To change to pounds 3392.7 grams /1000= 3.3927 kilograms X 2.2= 7.46 lbs 0 Share this post Link to post Share on other sites

May 21, 2007 by Daytonite, BSN, RN Daytonite has 40 years experience as a BSN, RN and specializes in med/surg, telemetry, IV therapy, mgmt. 2 Followers; 4 Articles; 14,602 Posts; 101,612 Profile Views well, first of all, stop freaking out. nurses don't freak out. they use their brains and any resources they can get their hands on to find answers. do you have a nursing drug reference or a medical dictionary? check the appendices in those and in your nursing textbooks for a table of weight or volume equivalents. you'd be surprised what the appendixes of some of your books have. if they don't have conversion tables in them there is a website called convert me.com where you can get these: http://www.convert-me.com/en/ 1 kg = 2.2 pounds 1 kg = 1000 grams 1 kg = 32 ounces (actually 32.15 ounces if you're a purist) 1 ounce = approx 30 gram (actually 31.1 grams if you're a purist) 1 ounce = 30 ml (or cc's) 1 liter = 1000 ml 1 pound = 454 grams (actually 453.59 grams if you're a purist) 1 pound = 15 ounces (14.583 ounces if you're a purist) with those conversion factors you should be able to convert a baby's weight and their feeding formulas. baby lost 7% of birth weight of 3648 gm. how much do they now weigh in gr, kg, lbs. this problem is asking "what is 7% of 3648 grams. give your answer in grams, kg and pounds." whenever you see a word problem asking for a percentage of something you are looking at a multiplication problem. expressing the answer in grams, kg or pounds involves applying a conversion factor to the final answer. all of this can be easily accomplished using dimensional analysis (factor label method), like this: 7/100 (percentage) x (of) 3648 grams/1 (baby's weight) = 255.36, or 255 grams (rounded off). that is the 7% weight loss. to find the baby's weight now, subtract that from the starting weight so that 3648 grams (starting weight) - 255 (7% weight loss) = 3393 grams (current weight) to convert to kg: 3393 grams/1 (baby's current weight) x 1 kg/1000 grams (conversion factor) = 3.393 kg see if you can do the conversion to pounds. 0 Share this post Link to post Share on other sites

May 21, 2007 by kas1965 Are you a credible source? Add your Credentials, Experience, etc. 7 Posts; 581 Profile Views Thank you all. I think the biggest problem is no one ever explained how we do these. Math always raises my stress level, so this is once a semester as we take a test everyone. It really really helps seeing it broken down for me. 0 Share this post Link to post Share on other sites