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hey everyone and cereth registered nurse or en comm and in this video i'm going to be going over nagels rule this video is part of an Inc Lex review series over maternity nursing so if you're studying maternity be sure to check out the other videos in my playlist and as always in the YouTube description below you can access the free quiz that goes along with this lecture which will test you on calculating angles rule so let's get started first let's start out talking about what is nagels rule nagels rule is a calculation used for estimating the due date of a baby and it's based on a woman's last menstrual period now this calculation that you get with Nagle's rule is an estimation because it bases its calculation that the woman has a 28-day cycle which many women vary on their cycle length and the typical gestation period of 280 days which is 40 weeks and we know that a lot of times first-time mothers can go over that forty weeks so this number is just an estimation now one thing you want to keep in the back of your mind while you're calculating Nagle's rule is that you need to remember the months that have 30 days versus 31 days and of course February you will always give it 28 days regardless of if a leap year is that you're just to keep things simple so to help you remember which months have 30 versus 31 I recommend remembering the mnemonic that maybe you were taught as a child that goes as the following 30 days hath September April June and November all the rest have 31 except February alone so those months that have 30 days September April June and November and all the rest have 31 now let's look at those calculation formulas that and you need to remember when calculating Nagle's rule there's two of them the first one you can use where you can have the last menstrual period of the woman and you will subtract three months from that add seven days to the last menstrual period and then add one here and then you'll get your estimated due date or you can use this you can add seven days to last menstrual period and then add nine months and that will give you the estimated due date now the thing with these is that as you can see here if your woman's last menstrual period was January through March it's best to use this calculation to keep things simple compared to this one because for instance and if the woman's last menstrual period was in January we just know nine months from January we'll be calculating out she'll be having it within that same year however if you're not paying attention and you're using this one you'll add a year to it putting it in the next year and you know one test that they will have both options...