The height of the standing of the fundus of the uterus is measured in centimeters, and its value roughly corresponds to the gestational age. When making a measurement, the gynecologist must take into account the physiological parameters in each specific case. Deviations within 2 - 3 cm are allowed, since the WDM value cannot be the same for all women, even for the same period.
How is fundal height (VDM) measured?
The height of the uterine fundus is an important indicator that determines the growth rate of the uterus during pregnancy. It is measured starting from the 16th week, when the uterine fundus becomes accessible to determine its changes through the anterior abdominal wall. To do this, the woman lies down on the couch, straightening her legs, and the doctor, using a centimeter tape or pelvic meter, measures the distance between the upper edge of the pubic joint and the upper point of the uterus, which protrudes from the pelvic cavity. Despite the brevity and simplicity of the procedure, its data allow the specialist to judge the growth and position of the fetus, as well as the amount of amniotic fluid.
Standing height of the fundus of the uterus
There are no absolute values of BMR at different stages of pregnancy, since this indicator depends on a number of factors:
- the structure of the female body;
- the height and weight of the pregnant woman;
- the weight of the fetus;
- what kind of pregnancy, etc.
Normally, the WDM value should coincide with the gestational age in weeks. However, by the end of pregnancy, VDM may be less than the generally accepted values by 5 cm.
However, when measuring WDM, gynecologists still adhere to some generally accepted values corresponding to a specific gestational age, and allow variations within 3 cm.At the same time, the doctor should always pay attention to the rate of increase in the WDM indicator in comparison with the previous measurement. From about 24 weeks, the BMR value is often exactly the same as the gestational age. And a few days before the onset of childbirth, due to the entry of the baby's head into the pelvic cavity, the uterine fundus drops by 2 - 3 cm.
Why WDM does not correspond to generally accepted indicators?
The height of the standing of the fundus of the uterus, which differs from the indicators of the norm in the lower direction, can be explained by such reasons as:
- lack of water;
- delayed fetal development;
- incorrect setting of the gestational age;
- features of the structure of the pelvis in large women.
During pregnancy, the uterus increases in size according to the growth of the fetus; by the time of delivery, its length reaches an average of 37 cm.
If the BMR exceeds the generally accepted norms, this may indicate an abnormal position of the fetus or its large size, multiple pregnancy or polyhydramnios. In women with a narrow pelvis, the WDM value may also be exceeded. If the indicators deviate from the norm, you should not immediately worry, because if with each visit to the gynecologist the uterus rises higher and higher, then the pregnancy is proceeding normally. If not, in order to exclude the development of pathology, the specialist gives the woman a referral for such important diagnostic studies as ultrasound, cardiotocography, Doppler, etc.