Yellow body 16, 17, 18 or 19 mm - what's the difference?
author: gynecologist Ambrosova IA
For successful pregnancy, unfortunately, only successful fertilization of the ovule is not enough. At this stage, the main role is assigned to the yellow body, which produces hormones, which are vital for implantation of the fetal egg in the uterine cavity and its further growth.
The yellow body is the formation that appears on the spot of the bursted follicle after the release of the egg. Normally this happens after every ovulation process. If fertilization occurs, the yellow body does not undergo reverse development, but continues to function for a long time (before the formation of the placenta). It should be noted that the vitality of the yellow body of pregnancy is due to hCG (human chorionic gonadotropin), which is formed after conception.
The appearance of the yellow body indicates that ovulation has indeed occurred. It should be noted that its dimensions fluctuate depending on which phase of secretion it is in.
Thus, in the phase of early secretion, or, as it is called, the early luteal phase (15th - 18th day of the cycle), a yellow body forms on the spot of the burst follicle, its diameter reaches 15-20 mm (as a rule, these dimensions are smaller than the dimensions dominant follicle).
In the middle secretion phase (middle luteal phase), which occurs on the 19th - 23rd day of the menstrual cycle, the "blooming" yellow body increases in diameter to 25-27 mm, and in the phase of late secretion (late luteal phase), the yellow body begins to fade, and its the dimensions are 10 - 15 mm.
If the pregnancy has not occurred, approximately on the ninth day of ovulation, the blood supply of this temporary intrasecretory gland begins to decrease, its tissue undergoes lyuteolysis, the capillaries are reduced and contracted, and therefore the local blood flow decreases markedly. As a rule, during the period of menstruation, the yellow body is not determined, since at this time its dimensions are only 2 - 5 mm (whitish hyaline body), and it disappears completely to the next cycle.
Thus, for the yellow body of menstruation, the dimensions 16, 17, 18 and 19 mm do not have a significant difference, since they are within the limits of the norm characteristic of the early luteal phase. However, if such dimensions are observed at later stages of development of the yellow body, this indicates a hormonal deficiency, and requires treatment. Or as a bright manifestation of the problem - the absence of a yellow body .
In the case when it comes to the yellow body of pregnancy, its size depends on the amount of hormones produced. It should be noted that in different periods of pregnancy, its dimensions are not the same. In the first weeks of development of the fetal egg it reaches the size of a large cherry, and as the placenta ripens, it gradually decreases and disappears by the tenth - sixteenth week of pregnancy.
The detection and evaluation of the size of the corpus luteum is performed using ultrasound. According to experts in normal sizes of the yellow body of the pregnancy range from 10 to 30 mm. In the event that there is an increase or decrease in its size, there is a suspicion of a deficiency of the yellow body or the formation of a cyst. Most likely it will be useful to read another article about the size of the yellow body called " Yellow body 12, 13, 14 or 15 mm - is there a difference? ".