How many weeks 3 screening? Routine examination of pregnant women

The Screening test is a one-time in each trimester. How many weeks 3 screening need to be taken, explain in detail the doctor. The main thing - to have time to conduct an ultrasound examination in the period from the 32nd to 36th weeks. At the last ultrasound finally determined the status and position of the fetus (by this time the fetus should occupy a longitudinal position with the head cephalic).

What examination includes screening 3rd trimester

Last screening consists of several procedures. For all pregnant women is compulsory only ultrasound, other procedures and tests are performed on prescription. In the set of possible diagnostics include:

• Doppler – 3 screening in pregnancy focuses on the proper positioning of the fetus and the stage of maturation of the placenta (during this period it should be 2 to stage of maturity).
• BHL – cardiotocography (study the heart rate of the fetus).
• Blood chemistry (triple – with the determination of total HCG, PAPP-A and ɑ-fetoprotein).

Biochemical analysis is assigned only under certain indications. In the last trimester, unlike the first, it is necessary to conduct a test triple instead of double, to more fully assess the development of the fetus.

What are ultrasound in the 3rd trimester

How many weeks 3 screening need to hold each doctor determines individually. It depends on many factors. At the last ultrasound, much attention is paid to the following characteristics:

• State of the cardiovascular system, the presence of heart disease or other abnormalities, localized in this region.
• As in the last few weeks is quickly growing and developing brain, on ultrasound examination of this organ is given special attention (in particular the brain and the medulla).
• Carefully studied Vienna Galena, which is located in the cranial cavity and has an important function for the normal functioning of adjacent organs.
• Evaluates the condition of a person – especially nasolabial triangle, upper lip and eyes. Time 3 screening can accurately determine the correct development of the facial region of the fetus and to exclude any pathology.
• The importance of proper development and condition of the spine, abdominal organs, urogenital system.
• Diagnosed as amniotic fluid, umbilical cord and placenta (its thickness, localization and degree of maturity).
• Also necessarily examines the genitals of the mother: the uterus and appendages.

In addition to these indicators, the doctor evaluates the particular location of the fetus in the uterus, the presence of umbilical cord entanglement and fetal presentation. When ablitiy neck cord you may need additional ultrasound in a week or two to see whether the changed position of the fetus and persists whether the entanglement. In some cases, you may need a cesarean section.

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Holding of Doppler imaging

Doppler is a study of the characteristics of blood flow in the umbilical cord, the vessels of the uterus and fetus. Necessary to determine the characteristics of blood flow allows to detect the lack of oxygen, presence of abnormalities of the Central nervous system or cardiovascular system.

How many weeks 3 screening ultrasound and Doppler Velocimetry can be carried out? As a rule, in the presence of a suitable apparatus, enabling to diagnose characteristics of blood flow, these studies are carried out at the same time. Therefore, when the need for Doppler gynecologist will be sent to the laboratory where it is possible to conduct two surveys. In addition, this approach will significantly save money.

Holding of cardiotocography

KTG carried out to determine possible fetal hypoxia. Allows you to define the number of heartbeats of the child in rest and at physical activity. How do screening of this type? The survey is like an ultrasound, the only difference is that in CTG the fruit and its blood flow is not visualized and the screen is designed only especially palpitations – deceleration or acceleration (depending on tests).

3 screening it is possible to determine the degree of maturity of the lung tissue and the willingness of the child to birth. With detection poor results may require referral of the pregnant woman and in some cases, early delivery with the aim of preserving the life and health of mother and child.

How do screening: the features of the CTG

If the characteristics of the ultrasound all clear, the technique of carrying out of cardiotocography causes pregnant women have a lot of questions. The survey is to use the ultrasonic sensor, it may be convex or flat. The sensor is fixed on a pregnant belly with a soft strap in the place where it listens for the fetal heartbeat.

The Woman at this time provide a special panel to which it will be necessary to press at the time of fetal movements. The procedure takes approximately 40 minutes. If necessary, the doctor may recommend a cause of fetal movement, irritating the abdominal wall or eating a piece of chocolate.

When callingfetal movements such methods fail, the doctor can resort to the introduction of veins of drugs with which the drug will be displayed, is there a fetal hypoxia.

Blood chemistry

In addition to these surveys also require a blood chemistry that includes 3 screening. What are you looking at in this analysis? In addition to the standard indicators of total HCG and of PAPP-A is an obligatorily survey indicators free estriol and placental lactogen.

All indicators in norm should be in the range of 0.5-2 Mω. If measurements are in different units, then the laboratory will be specified rules in another column. Since each laboratory has its own peculiarities calculate the normal indicators of pregnancy hormones in the blood.

These figures indicate the normal development of the fetus, if their concentration is in the normal range. Most often blood tests are prescribed only in case of bad tests, which were done in the second trimester of pregnancy.

The Timing of the 3rd screening

"When do 3 screening?" – question and answer which can only doctor. The final dates for the survey depend on the individual characteristics and indicators of a pregnant.

Most Often an ultrasound performed at 32-34 weeks, after which the results obtained must be sent to the biochemistry of blood. Conduct CTG and Doppler can begin with the 28th week, especially if there are special indications of the doctor.

Timely inspection allows one to exclude the possibility of fetal hypoxia and other dangerous changes in its development.

What kind of training includes 3 screening

What doctors look greatly influences the characteristics of training pregnant. So, ultrasonography, Doppler and CTG does not require prior training. While a blood test requires compliance with a certain diet. The list of banned products includes:

• Fatty and fried foods;
• Savoury dishes;
• Meats;
• Chocolate.

Also it is worth mentioning that directly before testing, you must endure 4-hour break in eating. Diet is necessary for maintaining normal condition of the blood plasma, as when eating fatty foods at her deposited fat drops that distort the results, and in some cases made it impossible for diagnosis.

The rules of the third screening

The deciphering of the 3 screening requires care on the part of doctors. In the third trimester there are certain indicators and their norms. The main ones are:

• Thickness of the placenta. Normal at term 32-34 weeks thickness in the range of 25-43 mm.
• The Degree of maturity of the placenta. On the 32 th week the placenta is located on the 1st or 2nd degree of maturity.
• The index of the amniotic waters. Is in the range of 80-280 mm.
• Internal cervical OS of the uterus should be closed, and its length is to be not less than 3cm.
• The tone of the uterus in norm should not be available. Otherwise, there is the probability of a premature birth or placental abruption.
• Fruit Weight is within 2 kg, and rising 45 cm, anomalies and developmental pathology in the norm do not exist.

To Properly decode the results of the survey can only doctor, who initially leads the pregnancy and knows all the nuances of its flow. "How many weeks 3 screening is optimal to set?" – this is a question that depends on many individual factors.