A fetoprotein of 34 ng/ml at 17 weeks of pregnancy indicates a low value. If the value increases to some extent with the increase of the gestational cycle, it usually has little effect; however, if the alpha-fetoprotein does not increase normally and shows a continuous decrease, it is considered abnormal. Under normal circumstances, at 17 weeks of pregnancy, the alpha-fetoprotein value should reach 45ng/ml, while the current alpha-fetoprotein index is 34ng/ml, which is considered to be a low value. However, if the value increases gradually with the increase of pregnancy cycle in the later stage, without other abnormal reactions, it is considered normal and generally does not require special treatment. At 17 weeks of pregnancy, if the alpha-fetoprotein is persistently low, and the alpha-fetoprotein does not increase after the increase of gestational cycle, and the level continues to decrease, then it is considered abnormal. At this time, it is mostly suggestive of abnormal fetal development, often associated with trisomy 21, gestational hypertension, gestational diabetes mellitus, and can be analyzed through amniocentesis, blood glucose, blood pressure testing and other comprehensive diagnostic analysis. At present, low alpha-fetoprotein is detected, which should be taken seriously, and regular labor and delivery tests should be done to understand the development of the embryo. During this period, pregnant women should be emotionally relaxed and avoid anxiety and tension.