Normal Amniotic Fluid Index Size on Ultrasound
Learn the ultrasound threshold for polyhydramnios: an amniotic fluid index (AFI) greater than 25 cm defines abnormal amniotic fluid volume in pregnancy.
Fetal
5 entries
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Normal Amniotic Fluid Index Size on Ultrasound >24 Weeks
Learn the normal amniotic fluid index (AFI) threshold on ultrasound after 24 weeks and the clinical significance of AFI below 5 cm.
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Normal Fetal Renal Pelvis Diameter Size on Ultrasound
Normal fetal renal pelvis diameter is <4 mm before 32 weeks and <7 mm after 32 weeks on prenatal ultrasound, guiding hydronephrosis assessment.
Normal Fetal Thorax/Abdomen Circumference Ratio on Ultrasound
Normal fetal thorax-to-abdomen circumference ratio is >0.77 on ultrasound, a key marker for detecting thoracic hypoplasia and lethal skeletal dysplasias.
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Normal Nuchal Thickness Size 18–22 Weeks Ultrasound
Normal fetal nuchal fold thickness measures less than 6 mm on ultrasound between 18–22 weeks; values at or above this threshold raise concern for aneuploidy.
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