Which is best method to assess fetal damage in a diabetes mother in 1st trimester is:

In diabetic patients: Most sensitive test/best test to assess the risk of fetal malformation is maternal HbA1 c levels The best test to detect fetal malformations is USG. Now question says - which is the most sensitive screening test to detect congenital malformations. Undoubtedly ultrasound should be the first choice but it is not given in the options.