During pregnancy, the kidneys of the expectant mother work more intensively, since they are faced with the task of evacuating from the body not only the products of their metabolic processes, but also the metabolic products of the fetus. Many women ask if a urine test shows pregnancy. Unfortunately, it is impossible to determine the presence of pregnancy by a general urine test; there are other methods for this, such as a test for hCG.
In the first 12 weeks of pregnancy, blood flow increases, and therefore all organs begin to receive a larger volume of circulating blood. Glomerular filtration increases, and tubular reabsorption does not change throughout pregnancy, which causes the development of edema, fluid retention in the body.
As the uterus grows, the position of the internal organs changes. In the third trimester, the bladder moves upwards outside the pelvis, its walls thickening to withstand increased uterine pressure. In rare cases, a hydroureter occurs - a violation of the patency of the ureter, usually the right one. This is due to its compression at the level of the pelvic bone.
Under the influence of progesterone, the tone of the urinary tract decreases, they expand, as a result of which the infection penetrates the bladder more easily with the subsequent development of pyelonephritis.