No studies have shown that high homocysteine causes fetal arrest, but high homocysteine may increase the risk of fetal arrest. Homocysteine is a sulfur-containing amino acid that is an intermediate product of the metabolic processes of methionine and cysteine in the body. Elevated homocysteine increases the risk of coronary heart disease, peripheral vascular disease, and cerebrovascular disease. Elevated homocysteine during pregnancy needs to be combined with the results of other tests to determine whether or not fetal arrest will occur. When a pregnant woman has a high homocysteine level, she must go to a regular hospital for timely examination and treatment under the guidance of a doctor.