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| Year | Technique | Results |
| Before 1993 | Cordocenthesis Hb electropholesis |
Hb Barts' hydrops 2 cases |
| 1993-1998 | Amniocentesis PCR technique |
Not Hb Barts' 4 cases Normal 6 cases Alpha-thal 1 trait 6 cases Hb Barts' 4 cases Total PND 24 cases |
| Year | Technique | Results |
| 1996-1998 | Amniocentesis PCR technique |
Normal 1 cases beta-thal trait 5 cases beta-thalassemia/Hb E 2 cases Total PND 8 cases |