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About the Chart
Transvaginal sonography. Percentage of six embryonic structures present or absent (bold) during first trimester of pregnancy in patients evaluated with transvaginal sonography. Note: Yolk sac is not usuallly seen after 12 weeks gestation.
| Weeks of Gestation | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| GESTATIONAL SAC ONLY | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| YOLK SAC | 0 | 90 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| FETAL POLE W/HEART MOTION | 0 | 0 | 86 | 100 | 100 | 100 | 100 | 100 | 100 |
| SINGLE VENTRICLE | 0 | 0 | 6 | 82 | 100 | 25 | 0 | 0 | 0 |
| FALRX | 0 | 0 | 0 | 0 | 30 | 75 | 100 | 100 | 100 |
| MIDGUT HERNIATION | 0 | 0 | 0 | 0 | 100 | 100 | 100 | 50 | 0 |
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