The amniotic fluid index in normal human pregnancy. The amount of amniotic fluid is measured either by checking the largest pocket of fluid by ultrasound or by measuring the largest amniotic fluid pocket in each of four quadrants and then adding those up. The index is determined by performing ultrasound examination of the uterus. An AFI<5-6 is considered as oligohydramnios. Very low values are associated with intrauterine growth restriction and renal anomalies of fetus, whereas high values may indicate fetal GI anomalies, maternal diabetes mellitus, and so forth. Amniotic fluid index (AFI) AFI – Amniotic fluid index. AFI = 10cm. ... Corpus luteum (CL) chart during the menstrual cycle. There are a few ways to estimate amniotic fluid volume. Typically, the AFI calculation is determined as part of routine ultrasound examinations, somewhere around the 20th week of pregnancy or a little later. Amniotic fluid index (AFI) is a quantitative estimate of amniotic fluid and an indicator of fetal well-being. Normal AFI values range from 5 to 25 cm [1, 4]. The amount of amniotic fluid has a certain range of normal values, the numbered score derived by adding up the centimeters of depth of four pockets of fluid seen on ultrasound. This is called the AFI or Amniotic Fluid Index. Amniotic fluid index (AFI) is one of the major and deciding components of fetal biophysical profile and by itself it can predict pregnancy outcome. Yolk sac (YS) chart. Background . BACKGROUND: Amniotic fluid is essential to normal fetal development and is estimated clinically with ultrasound scanning to identify pregnancies that are at risk for poor perinatal outcome. The normal physiological changes that occur to AFV as term approaches (see chart above) and/or the ‘normal’ level for the individual mother/baby is comparatively low to the general ‘norm’. Jeng CJ, Lee JF, Wang KG et.al. It can serve as an indicator of fetal well-being. The amniotic fluid index (AFI) is a measurement and scale of the amount of amniotic fluid present in the womb while a woman is pregnant. An amniotic fluid index of more than 5 cm is thought to be an adequate volume of amniotic fluid. Amniotic fluid index (AFI) is a quantitative estimate of amniotic fluid. Dizon-Townson D, Kennedy KA, Dildy GA et.al. Some researchers feel one good pocket of 3 centimeters depth is enough to assume that there is adequate amniotic fluid … Fetal heart rate (FHR) chart. Decreased amniotic fluid index in … Corpus luteum (CL) chart during pregnancy. Nasal bone (NB) chart. Am J Obstet Gynecol 1990;162:1168-1173. Amniotic Fluid Index: four ‘pockets’ of fluid are measured by ultrasound and added up resulting in an Amniotic Fluid Index (AFI) eg. OBJECTIVE: Our goal was to develop a United States standard for amniotic fluid volume that is estimated by the amniotic fluid index and single deepest pocket. The modified biophysical profile is considered normal if … Generally speaking, an AFI between 8-18 is considered normal. Pregnancy weight gain. Amniotic fluid index and morbidity. During a normal ultrasound, your doctor or an ultrasound technician will check on your amniotic fluid levels. Based on available data from randomized control trials (RCTs) the American College of Obstetricians and Gynecologists (ACOG) supports the use of the deepest vertical pocket of amniotic fluid volume of 2 cm or less to diagnose oligohydramnios rather than an amniotic fluid index of 5 cm or less . Reference Ranges of Amniotic Fluid Index in Late Third Trimester of Pregnancy: What Should the Optimal Interval between Two Ultrasound Examinations Be? Am J Perinatol 1996;13:231-234. Categories Calculators Tags eng, fetal ultrasound afi, tool fetal ultrasound, tools. Table 1 AFI values from 34 to 40 weeks; mean, standard deviation, and percentile values (all in centimeters).
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