Ultrasound, including vaginal ultrasound and transabdominal ultrasound, can provide information about the condition of a woman’s follicles. Different modalities are suitable for different groups of people, and women can choose them according to their personal needs. 1. Transabdominal ultrasound: this kind of examination needs to place the probe on the lower abdomen and pass through the abdominal wall to observe the situation of the ovaries, which are located in a deeper position, and it takes a certain amount of time to explore the follicles, so it is more suitable for women who are thin, have less abdominal fat and are able to hold their urine. 2. Ultrasound: Compared with abdominal ultrasound, the probe of ultrasound will enter from the vagina to the back of the cervix, and the position of the ovaries is very close to the ovaries, so the follicles can be observed more clearly. Therefore, if a woman has a chubby body and is sexually active, then she can opt for a vaginal ultrasound. In conclusion, both the vaginal ultrasound and transabdominal ultrasound can detect follicles. If a woman is not sexually active, she can only choose abdominal ultrasound to observe the follicles; if a woman is sexually active, try to choose the vaginal ultrasound examination, which can detect the follicles more clearly.