Placental grading on ultrasound is based on following criteria:-
**Core Concept**
The placental grading system on ultrasound is used to assess the placental maturity and function, which is crucial for fetal well-being and pregnancy outcome. This system evaluates the placental morphology, vascularization, and echogenicity to predict fetal growth restriction and other complications.
**Why the Correct Answer is Right**
Placental grading is based on the Sonographic scoring system developed by Manning et al., which assesses the placental thickness, echogenicity, and vascularization. The scoring system ranges from 0 to 10, with higher scores indicating better placental function. The placental thickness is evaluated by measuring the distance from the placental edge to the fetal surface, while the echogenicity is assessed by comparing the placental texture to the fetal bone. Vascularization is evaluated by assessing the number of chorionic plate vessels and the presence of a single umbilical artery.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not specify any criteria for placental grading.
**Option B:** This option is incorrect as it does not provide any valid criteria for placental grading.
**Option C:** This option is incorrect as it does not specify any valid criteria for placental grading.
**Clinical Pearl / High-Yield Fact**
A normal placental thickness is less than 3.5 cm, and a single umbilical artery is associated with an increased risk of fetal growth restriction and other complications.
**Correct Answer: C. The Sonographic scoring system developed by Manning et al. assesses the placental thickness, echogenicity, and vascularization.**