Step 1: Register for a general otolaryngology number and go to the treatment room on the 4th floor of the otolaryngology outpatient clinic to open a checklist Step 2: After all the checklist results are available (it takes 2-3 days), go to the 6th floor of the otolaryngology outpatient clinic to review and open an additional number for the obstetrics and gynecology specialist, Dai Park, Department of Otolaryngology, Beijing 301 Hospital Step 4: After the OB/GYN consultation, go to the prenatal diagnosis center office on the 5th floor of the outpatient building at 14:30 —–16:30 on Monday afternoon to see Dr. Sun Jing for an appointment. Step 5: After a successful appointment, go to the 6th floor of the otolaryngology clinic to receive the “tube”. Step 6: On Tuesday afternoon at 13:30, line up at the ultrasound department’s room 10 on the 4th floor of the outpatient building for puncture and sampling Step 7: Bring the “specimen”, “ENT Institute test application form” (after paying the fee and stamping), and The “standardized procedure for prenatal diagnosis of deafness genes” will be sent to the 6th floor of the Otolaryngology Clinic. Step 8: 7 working days from the date of puncture for consultation on whether the test is completed.