Urea and creatinine are both low during pregnancy, and many people think that there is something wrong with their bodies when they see low urea and creatinine, but in fact this is a normal phenomenon and pregnant women should not be too nervous. In addition to excreting urine and eliminating toxins, the kidneys play an important role in the human body as well as an important endocrine function, which plays an important role in water and sodium reabsorption, maintaining the body’s acid-base balance and maintaining environmental stability. During pregnancy, the glomerular filtration rate and renal blood flow increase and remain at high levels throughout pregnancy. Due to the increased excretion of urea and creatinine, the levels of these two substances in the blood of pregnant women are lower than those of women in the general population, resulting in lower than normal levels of urea and creatinine in blood tests, and pregnant women should not be overly nervous about this situation.