Criteria | 4-cavities | Large vessels | Kidneys | Stomach/Diaphragm | Spines | Face |
1 | 4 visible cavities | Bifurcation of the visible pulmonary artery | Circular view of the first kidney | Visible heart | Visible dorsal spine | Upperlip visible |
2 | Visible heart tip | Visible ascending aorta | Circular view of the second kidney | Visible stomach | Visible sacrum | 2 visible nostrils |
3 | Cross of the visible heart | Right ventricle visible | Rear kidney free of vertebral shadow cone | Spine not visible | Visible vertebral alignment of the dorsal spine with the sacrum | 2 labial angles seen |
4 | A visible pulmonary vein | Wrapping of the pulmonary artery around the aorta | Visible cortico-medullary or pyelon differentiation | Diaphragm interface seen from front to back | Skin continuity |
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5 | Visible descending aorta |
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| Thigh and neck visible | Amniotic fluid beyond the skin |
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6 | Area of interest occupying more than half of the image |
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