Although the test strip method is simple to use, not everyone can use it correctly and get accurate results. This may be related to the following situations:

1. Detection time. HCG usually appears in urine a few days after the fertilized egg implants, and it must reach a certain amount to be detected. Therefore, for women with normal menstruation, HCG may be detected in urine only after their menstruation is delayed. Women with long menstrual cycles or abnormal ovulation can only be detected after 40 to 44 days of menopause.

2. Urine dilution. Drinking too much water may cause a false negative result if your urine is diluted.

3. Testing in the morning and evening may have a certain impact on the results. Morning urine generally has the highest HCG value, so many instructions recommend testing when you get up in the morning, but this is not absolute.

4. Pay attention to the length of the urine immersed test paper when testing. Sometimes the length of the urine immersion test strip is too long, which can make the test results difficult to judge.

5. Do not rely on test results to determine whether you are pregnant if you have recently had a pregnancy. Because HCG can remain positive for a long period of time after termination of pregnancy (after delivery, spontaneous abortion, and induced abortion).

6. Some diseases and drugs may cause false positive results. Some tumor cells, such as hydatidiform mole, choriocarcinoma, bronchial carcinoma and renal cancer, can also secrete HCG.

7. Do not use expired test strips. Because chemical reagents lose their effectiveness over time, pay attention to the production date when purchasing.

8. Do not use test strips that have become damp.

To get correct results, it is best to do a pregnancy test when menstruation is delayed for two weeks. If the test result is negative and you still haven't had your period after 1 week, you should try again.

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