Abnormal results in the T can be done without amniocentesis?

Patient's question:

Pregnancy 18 weeks and 5 days, did a triple screen, the results are: HCGB 0.28 (reference value 0.3 - 2.5), AFP 1.01 (reference value 0.4 - 2.5), risk value for trisomy 21 syndrome 1:18000 (reference value

Doctor's answer:

Hello, in this case it is recommended to have an amniocentesis. Wishing you good health.