When necessary, alternative methods of calculating the period
Even if a woman knows the start date of your last bleeding, but her menstrual cycle is characterized by great irregularity, based on the standard method of calculating the duration of pregnancy is impossible. Besides, it may happen that it took for my period light bleeding, occurring with the existing pregnancy. To more accurately determine the date of future delivery, and may even have to resort to less common ways of calculating the pregnancy.
The definition of the term ultrasound
Modern technology can greatly facilitate difficult at first glance task. Manufactured today devices of ultrasonic diagnostics allow up to 1 day to establish the age of a small embryo, but only in case if the pregnancy does not exceed 12 weeks. All the kids prior to this period grow equally, later on the size start to influence features of personal development.
The height of the uterine fundus
If to determine the exact period when ultrasound is not possible, you have to resort to more ancient methods, it is necessary to remember that these are approximate and depend on them should be more than careful.
One of such methods is the definition of height of standing of uterus day. Starting from 16 weeks, the doctor may palpate through the abdominal wall, and if it is, for example, reaches the navel, it is possible to say that the gestation is 22-24 weeks.
Even accurately calculated due date is not absolute and serves only for reference, because a normal pregnancy ranges from 38 to 42 weeks.
The least accurate criteria on which to define the term, are stirring. According to obstetric textbooks nulliparous women begin to feel the first tremors on the 20th week, the more experienced their fellow member at 17-18. But as practice shows, everything is so highly dependent on the sensitivity of women, sometimes even suspicion, the location of attachment of the fetus in the uterus and temperament of the child, some expectant mothers already at 14-15 weeks boasted the first "pinocchi", while others fall into a real panic due to the fact that, at 21-22 weeks of not feeling anything at all.
Sometimes when calculating the period of pregnancy can help date of conception, if known more or less accurately.
Which way is more precise
Therefore, if the monthly date is unknown, you should contact an experienced usesto, only in this case the pregnancy can be calculated more or less accurately. All other methods give more than an approximate version they should be considered only as an auxiliary method.
Advice 2: How to determine the pregnancy by ultrasound
You will hardly find at least one woman who does not seek to determine the date of the upcoming birth and the estimated time of conception after learning of her pregnancy. Yes, and the doctor-obstetrician, it is important to know the exact period of gestation for assessment and monitoring of the development and growth of the fetus and timely conduct of a corrective therapy. There are several ways to find out the period of pregnancy, but the most accurate is an ultrasound scan of the uterus and fetus.
Remember that ultrasound is safe for the fetus and has no limitations in pregnancy. In the case of favorable course of pregnancy this kind of prenatal diagnosis you will be assigned three times.
Note that different timeOh pregnancy doctor available amount of information about the fetus, and the period of pregnancy is set according to strictly defined criteria. Therefore, a so-called screening and defined periodand that ultrasonographic examination is more accurate, for this important time period information. For example, the gestational periode 2-3 weeks in the uterine cavity is visualized only the ovum is, roughly speaking, a doctor can give the conclusion she is pregnant or not. With 4 weeks of gestation experienced ultrasound doctor can see the body of the embryo (the average size of the ovum will be in this period of 3-4 mm). At 4-5 weeks, you record the heartbeat of the baby. Separate movements of the baby are visualized with 7 weeks of fetal life.
Head as a separate anatomical education is defined from 8 weeks, and of course with 9 weeks of pregnancy. During this period, the doctor evaluates the size of the middle inner diameter of the ovum (SVD) and kopcik-parietal size of the embryo (CTE) and compares the received data with tabular or program ultrasound scanners, and determines a period of pregnancy with an accuracy of ± 6 days. At the end of the first trimester of development (11-12 weeks) you can scan a particular structure of the brain of the unborn child. It was at this time the ultrasound said period of pregnancy, is determined by the number of fetuses, measure the nuchal translucency thickness and nasal bone for exclusion of chromosomal defects.
Be aware that in the future your little one on the ultrasound display apparatus will be more and more like a real person. Each time during the study doctor will carry out the measurement of key indicators of biophysical development of the fetus, namely biparietal (between the parietal tuber) and labanotation sizes of head, chest circumference, abdominal circumference, length of the nasal bone, length of femur. Developed specific tables and embedded programs for ultrasound devices, which can determine the period of pregnancy with an accuracy of ± 1 week.
Advice 3: How to determine the date of menstruation
Periods (menstruation) is a cyclic rejection of the mucous membrane of the uterus (endometrium) which is accompanied by a bloody discharge from the vagina. Menstruation occurs once a month, during the entire reproductive period of a woman's life. My period starts in adolescence and ends with menopause. The essence of the menstrual cycle is to prepare the woman's body to conceive.
The menstrual cycle is the period from one menstruation to another. The first day of bleeding is considered the first day of the cycle. The last day before your next period is the last day of this menstrual cycle.
Normal duration of menstrual cycle varies from 21 to 35 days. Ideal is a 28-day cycle. Although it is found in 15% of women.
Periods last from 3 to 7 days, and blood loss ranged from 50 to 75ml.
Monthly begin ages 9 to 15 years. Age varies depending on race, physiological factors, diet, intensity of exercise and genetics. The period between the beginning of breast development and first menses is about two years.
Every menstrual cycle is characterized by two reproductive processes. The first is the maturation and release of the egg from the ovary and the second is to prepare the uterus for implantation of a fertilized egg. The first time (a year and a half) of the menstrual cycles can be irregular. This time formed by a reproductive system.
To determine the date of next menstruation, it is important to determine the length of your menstrual cycle. For this fit the calendar. If for several months you will note the dates of first and last day of the cycle, then you will know your cycle length and can calculate the day of the beginning of the next month.
Sometimes menstrual irregularities. They are expressed in the change of cycle length, duration of menstruation or change in the amount of blood loss. If the duration of your cycle is less than 21 days or more than 35 days, it is a reason to go to the doctor. If my period started to last for less than 2 or more than 7 days, you need to consult a gynecologist. Scanty or heavy blood selection must also be the reason for visiting the doctor.
Girls and women are encouraged to maintain a calendar.
If you smoke, the risk of menstrual disorders increases 5 times.
If you smoke, the risk of menstrual disorders increases 5 times.
Advice 4: As doctors establish a pregnancy
Doctors establish the approximate duration of pregnancy date of last menstrual period, but this factor is not the only one. Be sure the midwife takes into account the data of gynecological examination, ultrasound, the date of the first stirring and other factors.
Date of the first day of menstruation indicates the beginning of a cycle of oocyte maturation, which subsequently fertilized and lead to pregnancy. It is believed that pregnancy occurs 2 weeks after the beginning of the menstrual cycle, because most ovulation occurs on day 14 of the cycle, and it is in this day a woman can get pregnant. If the woman does not remember when was my period, the period is determined by the other leading factors. Sometimes, the pregnancy, but there is about month, in this case, the date when it was spotting, does not affect the period of fetal development.
At statement on the account of pregnant obstetrician necessarily carries out a pelvic exam. The vulva of a pregnant acquire cyanonet (bluish tint) at 6-8 weeks of pregnancy.
When pregnancy is characterized by persistent areas of redness on the cervix (Chadwick symptom). Gynecologist palpates uterus, determining its size. At each period of fetal life the genital organ has a certain size. For example, in 7 weeks of pregnancy the uterus approximately with the average chicken egg, for 10 weeks it has a size of 110 by 80 mm, etc.
Fetal ultrasound gives the most accurate information about the pregnancy. Doctor with ultrasound in the first trimester of pregnancy measures the display apparatus of kopchik-parietal size of a fetus, biparietal size of the embryo and diameter of yolk sack. With 5-6 weeks of pregnancy experienced uzist-gynecologist will distinguish the length of the body of the embryo, which is 3-6 mm, then the fetus grows and the size increases. With 8 weeks of fetal development is determined by biparietal head size of the fetus at this period it is approximately 6 mm. Diameter of yolk sack is determined 6 weeks and is 3 mm3 by the end of the first trimester, it increases up to 6 mm3, and then begins to decrease.
The doctor uses special tables or programs in which the dimensions and their corresponding deadlines. As a rule, three parameters of the fruit correspond to the same time and not have differences. The increase in the biparietal size indicates pathology of the fetus and untimely development of yolk sack an indirect indication of intrauterine infection, as it practically performs the function of the liver. With infections of the yolk SAC failed in its purpose and does not correspond to the expected sizes.
In the second and third trimester of pregnancy, the doctor at the ultrasound determines the size of the large bones (thigh, shoulder), which also correspond to a certain period of fetal development. Do not forget that the fetus is a living organism, not a programmed machine, so the size of the bones in a child whose parents are tall, be longer than the norm.
The first movement of the fetus occurs more frequently in nulliparous at term of 20 weeks, and those who mother is not the first time, perturbation felt at 18 weeks. From these rules there are exceptions, for example, in case reduced, a high sensitivity threshold, or if the woman is severely complete, the stirring she feels later.
All the collected data, an obstetrician-gynecologist determines the approximate duration of the pregnancy, but the more he relies on us data.