Do test strips sometimes not measure accurately?

Patient's question:

No

Doctor's answer:

Hello, it is recommended to monitor ovulation through ultrasound. Starting from the 5th day after menstruation, an ultrasound examination should be performed every other day. Under normal circumstances, the follicle grows at a rate of 0.2 cm per day. Through ultrasound examinations until ovulation occurs, it can clearly determine the growth and development of the follicle, as well as whether ovulation has taken place.