Ultrasound ovulation test is about 30 yuan a time, the fee is lower than color ultrasound, ovulation test needs 3-4 times a cycle, personally I recommend using ultrasound can be completely checked, do not need to use color ultrasound. It is important to hold urine during the examination, and more importantly, to master the examination time, that is, from the first day of menstruation to the 10th day of examination, to look for the largest follicles in both ovaries, which are usually about 10mm in diameter at this time. Because the follicles grow at a rate of 1-2mm per day, it is important to check them every 2-3 days to continuously observe their development. Mature follicles are 18-25mm in diameter. When the follicles are found to be 18mm or more in diameter, ultrasound should be continued to observe them to see if they can ovulate. For women who are obese and not good at holding their urine, it is recommended to have a negative ultrasound, which costs about$80 a time.