What is the normal range for amniotic fluid index at 39 weeks?

Oct 18, 2023 Source: Cainiu Health

Dr. Zhao Xiaodong

Introduction

Under normal circumstances, the amniotic fluid index (AFI) at 39 weeks of gestation ranges between 5 cm and 25 cm. Amniotic fluid generally refers to the liquid within the amniotic cavity of the uterus during pregnancy. The amniotic fluid index measures the vertical depth of the largest pocket of amniotic fluid in the uterine cavity, and its specific value varies with gestational age. At 38 weeks of pregnancy, delivery is approaching, and pregnant women are advised to maintain a balanced diet.

Under normal circumstances, the amniotic fluid index (AFI) at 39 weeks of gestation typically ranges from 5 cm to 25 cm. If any discomfort occurs, it is recommended to seek medical attention promptly. Specific details are as follows:

Amniotic fluid generally refers to the liquid within the amniotic cavity of the uterus during pregnancy. The amniotic fluid index measures the vertical depth of the largest pocket of amniotic fluid in the uterine cavity, and its value varies with the stage of pregnancy. In early pregnancy, amniotic fluid mainly comes from maternal serum dialysate entering the amniotic cavity. During mid-pregnancy, small molecules and fluids exuded from the fetal body also contribute to the amniotic fluid. In late pregnancy, the primary source of amniotic fluid is fetal urine. At 39 weeks of gestation, which falls into the late pregnancy period, placental function gradually declines and amniotic fluid volume decreases accordingly. The normal range at this stage is between 5 cm and 25 cm. If the AFI is less than 5 cm, it may lead to fetal growth restriction, dry fetal skin, prolonged gestation, or increased maternal abdominal pressure. If the AFI exceeds 25 cm, pregnant women may experience abdominal pain and elevated abdominal pressure.

At 38 weeks of gestation, delivery is approaching. Pregnant women are advised to maintain a balanced diet, regular sleep patterns, and a relaxed mindset. If physical discomfort arises due to abnormal amniotic fluid levels, timely medical evaluation at a hospital is recommended.

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