spina bifida 12 week scan

Hi


I had my booking in appointment on Monday and my me mentioned that they can pick up on spina bifida at a 12 week scan. She mentioned the formation of the spine and also shape of the babies head, has anyone who has previously had a tfmr for sb had a 12 week scan where they are have looked for signs?


I'm so confused as I thought it would be look at at 16 weeks at the earliest