OBS / Pregnancy Calculator

Developer's DescriptionBy 3MajorsA Free easy to use calculator For an avid mother and a busy obstetrician to...A Free easy to use calculator For an avid mother and a busy obstetrician toknow the important dates and duration of your pregnancy (POG plus EDD),Time in weeks and days of your pregnancy.From only one date entry wealso calculate your expected date of delivery (EDD), which is alsocalculated by an obstetrician in your first ante-natal visit. This Obscalculator is very usefull to obstettrician who don't want to calculateExpected Date of Dilevery (EDD), and Period of Gestation (POG) manuallyand wants or needs a simple tool which only requires one entry. It usesParikh's formula for Asian countries accurate to Standard Deviation13days), and Naegli's formulae for the western countries EDD (Standarddevaition 13days). Primigravida's (First time mothers) are within Plusminus 7-9days of EDD. it is helpful to consider gestation time as arange of dates rather than as a single "due date". For instance, astandard deviation of 13 days means that 90% of babies will be bornwithin two weeks of their EDD, and 21% will be born within three daysof it. Only 4% of births will occur on the EDD.Refrences:(1). Bergsj P, Denman DW 3rd, Hoffman HJ, Meirik O. (1990). "Durationof human singleton pregnancy. A population-based study.". Acta ObstetGynecol Scand: 197207.(2). Gray, H (1962). "Duration of pregnancy.". Stanford MedicalBulletin 20: 248. PMID 13901307.(3).Dr H. Kieler, O. Axelsson, S. Nilsson, U. Waldenstr (1995). "Thelength of human pregnancy as calculated by ultrasonographic measurementof the fetal biparietal diameter". Ultrasound in Obstetrics &Gynecology 6 (5): 353357. doi:10.1046/j.1469-0705.1995.06050353.x.PMID 8590208.