Why are early pregnancy test strips invalid after 5 minutes?

Patient's question:

I have an itchy lower body, and my underwear is always yellow. What's going on? Why is the early pregnancy test invalid after 5 minutes?

Doctor's answer:

Hello, according to your description, it is recommended to check blood HCG one week after the menstrual period to determine if you are pregnant, or use a pregnancy test kit one week after the menstrual period, which generally can confirm pregnancy. The occurrence of gynecological diseases not only affects the patient's life but can also lead to the development of gynecological diseases. Therefore, it is best to go to the gynecology department of a hospital for a routine examination, identify the cause, and then receive symptomatic treatment. You should also drink more water and pay attention to personal hygiene.

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