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What is the normal value of amniotic fluid index (AFI)?

Dec 29, 2022 Source: Cainiu Health
Dr. Lv Aiming
Introduction
The normal amniotic fluid index (AFI) typically ranges between 7 cm and 16 cm. Amniotic fluid levels below 8 cm or above 21 cm indicate abnormality. If the AFI is less than 9 cm, it suggests oligohydramnios (low amniotic fluid). If it exceeds 21 cm, it indicates polyhydramnios (excessive amniotic fluid). When amniotic fluid abnormalities are detected, fetal malformations should first be ruled out as a potential cause.

In daily life, pregnant women all have amniotic fluid, which is the liquid within the amniotic cavity of the pregnant woman's uterus. Throughout pregnancy, it is an essential component indispensable for sustaining fetal life, and is therefore crucial for pregnant women. So, what is the normal value of amniotic fluid AFI?

What is the normal value of amniotic fluid AFI?

The normal amniotic fluid index (AFI) typically ranges between 7 cm and 16 cm. An AFI below 8 cm or above 21 cm indicates abnormal amniotic fluid levels. If the AFI is less than 9 cm, it suggests oligohydramnios (too little amniotic fluid). If it exceeds 21 cm, it indicates polyhydramnios (excessive amniotic fluid). When amniotic fluid abnormalities occur, fetal malformations should first be ruled out as a potential cause. If fetal development is normal but amniotic fluid is reduced, increasing fluid intake or rechecking later may help restore amniotic fluid to normal levels. In cases of excessive amniotic fluid, ongoing monitoring and follow-up are necessary. Continuous progressive increases or decreases in amniotic fluid volume require close attention, and hospital evaluation and treatment may be needed under such circumstances.

During pregnancy, amniotic fluid is slightly turbid and not completely transparent, often containing small flakes such as lanugo hair and urate crystals. In early pregnancy, amniotic fluid mainly comes from maternal serum that passes through the fetal membranes into the amniotic cavity. From mid-pregnancy onward, fetal urine becomes a major source of amniotic fluid. In late pregnancy, the fetal lungs also contribute to amniotic fluid production. About 52% of amniotic fluid absorption occurs via the fetal membranes. There is continuous fluid exchange within the amniotic cavity, maintaining a relatively stable amniotic fluid volume.

Pregnant women should pay more attention to self-care, enhance their resistance and immunity, promote healthy development of both themselves and their babies, and prevent various diseases. We hope this answer helps you. Wishing you good health and happiness!


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