For urine testing, it is preferable to take the first morning urine after thorough cleaning of the external genitalia and collect it in a sterile urine collector. Urine collects in the middle of urination, without interrupting its flow. Especially for culture, urine collection should be done before taking any antibiotic.
Throw away the urine of the first morning urination and collect all the urine during the day and night as well as the first morning urination the next day. During collection, urine should be stored in the refrigerator.