Embryo arrest is primarily diagnosed through ultrasound examination, and blood tests alone cannot fully determine embryo arrest.

Pregnant women still need to rely on comprehensive examinations to make a diagnosis. During pregnancy, the levels of progesterone and human chorionic gonadotropin (hCG) are continuously rising. If there are factors that cause embryo arrest, these values will no longer increase, or there may be a continuous decline observed during tests. Therefore, embryo arrest must rely on ultrasound examination for accurate diagnosis, supplemented by blood tests to measure hormone levels, using a comprehensive judgment to confirm the condition of embryo arrest.