First we need to know what gestational age taken weeks to calculate.9 months equal to 40 weeks, during which the expectant mother bears the child.However, doctors and mothers find themselves the week differently.Women rely on the start date of the last menstrual period (calendar calculation), and the doctors added to it two more weeks (maternity calendar).That's according to the obstetric calendar will be kept whole pregnancy until delivery.PRD is determined by the following formula Negele:
first day of your last period to + 280 days, or the first day of the last menstrual period - 3 months + 7 days.
Methods for determining gestational
signs of pregnancy. If you are planning a child, signs of pregnancy, but as the time of conception, will not be a surprise to you.Each term of pregnancy characterized by certain symptoms.If unfavorable circumstances or medical you need to terminate a pregnancy in early pregnancy , you should pay attention to the early signs of pregnancy: missed period, breast tenderness, mood swings, morning sickness.It's worth noting that the morning sickness begins to appear about 21 days of gestation, and the first woman feels fetal movements in the 20-21 week.
manual inspection.Learn term pregnancy, at least roughly, if possible two-handed examination, where a gynecologist one hand palpates the abdomen, and the second examines the cervix.At a certain change in the shape of the uterus may be about to understand how long ago there was a conception.Non-pregnant women the uterus is usually pear-shaped, and the period of 5-6 weeks corresponds to the shape of the ball a little longer characterized by the asymmetrical shape of the uterus.
Ultrasound diagnosis. determine the presence of ovum can only 5-6 weeks of pregnancy.So go to the US is only 7-10 days after a missed period.The size of the eggs doctor can determine approximately pregnancy.
Analysis of hCG. In the case of the first signs of pregnancy, the doctor sends a woman on laboratory tests.Identify pre-term pregnancy will help in the analysis of hCG (hormone horiogonadotropin).After passing the blood from a vein, a woman exactly know whether she is pregnant.This method is not used for such purposes, but if you want to learn gestational age , then pay attention to the relevant indicators of hCG weeks of pregnancy:
2 weeks - 25-300 IU / ml
3 weeks - 1500-5000 IU / ml
4 weeks - 10,000 - 30,000 IU / ml
5 weeks - 20,000 - 100,000 IU / ml
exactly know the gestational age alone can onlyif a woman follows the ovulation and menstrual cycle is regular, but even in this case there is a risk of inaccuracies.