Amniotic fluid volume

Amniotic fluid is the liquid in the amniotic cavity of the early embryo. The early pregnancy is mainly the leakage of maternal plasma into the amniotic membrane through the membrane. In the middle stage, fetal urine is the main source. Amniotic fluid has the function of protecting the fetus and protecting the mother during pregnancy. Amniotic fluid specimens are usually obtained by amniocentesis by a general practitioner. Amniocentesis can reflect the growth of the fetus in the uterus, maturity, gender, and diagnosis of certain hereditary diseases. Basic Information Specialist classification: maternity check check classification: ultrasound Applicable gender: whether women are fasting: not fasting Analysis results: Below normal: Amniotic fluid is rarely seen in fetal congenital malformations, renal hypoplasia and pulmonary hypoplasia and amniotic dysplasia. Normal value: Early pregnancy: 0.45-1.2L Full term pregnancy: 0.5-1.4L Above normal: Amniotic fluid is too common in fetal congenital anomalies, such as no brain, esophageal atresia, intestinal atresia. negative: Positive: Tips: Amniocentesis is usually performed in the second trimester (16 to 21 weeks of gestation). Normal value Early pregnancy 0.45 ~ 1.2L. Full-term pregnancy 0.5 to 1.4L. Clinical significance 1, excessive amniotic fluid refers to amniotic fluid > 2L, seen in 1 fetal congenital anomalies, such as no brain, esophageal atresia, intestinal atresia. No brain is caused by a decrease in the secretion of antidiuretic hormone due to brain hypoplasia. Esophageal atresia and intestinal atresia are caused by fetal phagocytosis of amniotic fluid dysfunction. 2 Also seen in maternal diseases, such as diabetes, may cause high blood sugar in the fetus due to high blood sugar, increase the diuresis of the fetus, and the amount of amniotic fluid can be reduced when the mother's blood sugar is controlled. 2, oligohydramnios refers to amniotic fluid <0.3L, seen in fetal congenital malformations, renal hypoplasia and pulmonary hypoplasia and amniotic dysplasia. 3, expired pregnancy, amniotic fluid is generally around 0.5L. Low results may be diseases: congenital pulmonary hypoplasia, congenital esophageal atresia, congenital intestinal atresia, renal hypoplasia, congenital abdominal wall muscle dysplasia, multiple fetal outcomes may be high disease: expired pregnancy, expired birth, amniotic fluid, No brain, oligohydramnios, amniotic infection syndrome, premature rupture of membranes Amniocentesis is usually performed in the second trimester (16-21 weeks of gestation). The urine should be drained before surgery, with both hands on the hips and gently turn the waist and abdomen. Inspection process B-mode ultrasound: It is the main auxiliary diagnostic method for polyhydramnios. At present, there are two standards widely used in clinical practice: one is marked by the umbilical line and the abdominal white line, and the abdomen is divided into four quadrants. The sum of the vertical diameters of the largest amniotic fluid dark areas in each quadrant is the amniotic fluid index (AFI). Domestic data amniotic fluid index>18cm can be diagnosed as polyhydramnios, and the other is amniotic fluid maximum pool depth (MVP or AFV)>7cm as the diagnostic criteria, MVP8～llcm is mild amniotic fluid, l2～15cm is moderate amniotic fluid Too much, ≥16cm is too much amniotic fluid. B-mode ultrasound can also understand fetal structural abnormalities such as no brain, dominant spina bifida, fetal edema and twins. The maximum depth of the sheep pool in late pregnancy is ≤ 2cm, or the amniotic fluid index ≤ 5cm, can diagnose oligohydramnios; the amniotic fluid index 8cm is suspected oligohydramnios. Fetal malformations should be ruled out when oligohydramnios is found in the second trimester. B-mode ultrasonography has a high diagnostic value for congenital renal deficiency, urinary tract obstruction, and intrauterine growth restriction. Direct measurement of amniotic fluid: After the membrane is broken, the amniotic fluid is directly measured, and the total amniotic fluid volume is <300 m|, which can be diagnosed as oligohydramnios. Not suitable for the crowd B-ultrasound examination of amniotic fluid is generally suitable for people. Adverse reactions and risks Generally no adverse reactions.

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