Pregnancy dating calculator

Anatomy More than 100 anatomy articles feature clinical images and diagrams of the human body's major systems and organs.The articles assist in the understanding of the anatomy involved in treating specific conditions and performing procedures.A normal pregnancy can last anywhere between 38 and 42 weeks.If you want to, you can view a sample due date report.On average only 5% of births take place exactly on the estimated due date.Most are born within a week either side of the estimated due date.

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If you would like to save your due date, you will need to log in or create an NHS Choices account - you can do this in the box below.The due date may be estimated by adding 280 days ( 9 months and 7 days) to the first day of the last menstrual period (LMP). The accuracy of the EDD derived by this method depends on accurate recall by the mother, assumes regular 28 day cycles, and that ovulation and conception occurs on day 14 of the cycle. Use of the LMP to establish the due date may overestimate the duration of the pregnancy, and can be subject to an error of more than 2 weeks [5-7]. They can also facilitate physician-patient discussions. Drug Monographs More than 7100 monographs are provided for prescription and over-the-counter drugs, as well as for corresponding brand-name drugs, herbals, and supplements. Drug Interaction Checker Our Drug Interaction Checker provides rapid access to tens of thousands of interactions between brand and generic drugs, over-the-counter drugs, and supplements.Check mild interactions to serious contraindications for up to 30 drugs, herbals, and supplements at a time.Determining the Date of Conception Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization. All information contained in and produced by the Med Calc 3000 system is provided for educational purposes only.This information should not be used for the diagnosis or treatment of any health problem or disease.The accuracy of the ultrasound estimate of the gestational age varies according to the gestational age. "Ultrasound measurement of the embryo or fetus in the first trimester (up to and including 13 6/7 weeks of gestation) is the most accurate method to establish or confirm gestational age" [24].

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