Methods of early detection include fetal blood sampling, amniocentesis, chorionic villi sampling, DNA restriction endonuclease analysis, and ultrasound examination.
怎樣及早發現？利用什麼方法來診斷呢？台大醫院婦產科醫師謝豐舟指出，超音波檢查、羊膜穿刺、絨毛採樣、胎兒採血、基因工程分析等五種，是目前較進步的診斷方法。