Just saw your post. It happened to me too. I’m expecting twins and during 20w scan, sonographer detected ARSA on one twin. Told me about linkage to DS. I was so worried and teared up. The on duty dr at kkh told me about the risks and asked me go counseling and do amnio the only option. If terminate 1 twin, the other twin may not survive too. If decide to terminate pregnancy I have to do so before 24w by law. Seen my gynae after that as was advised to do amnio as blood test is not 100% accurate.
So next day I called up many private gynae to book slot for second opinion. Went to one at Camden. Paid a hefty sum for another detailed scan.
After discussion with hub, we decided to go ahead with amnio to have a peace of mind. Opted for express result and for assurance that twin A has no DS. Phew really a sigh of relief after weeks of worrying and stress.
Well it all depends on what u want to know. Can u live with it without knowing the truth? What will u do if result is undesirable?