If you don’t know what kind of IUD you have, the following methods can help you understand exactly what kind of IUD you have. First, when a patient sees a doctor, the doctor will write a medical record, which will record in detail what happened and what IUD was used. Second, if the medical record is lost, you can find the original doctor, after registration, if the prescription is computerized, through the history of the medical record will pull out the past medical records, the past medical records will be clearly recorded, in fact, which kind of birth control ring, how long is the validity period, in the time to take the ring also convenient to take the ring. If neither of these two methods work, another option is to go to an outpatient family planning clinic, where the medical records are kept on file and the type of IUD that was used is recorded in the medical records.