Is the pregnancy test accurate if the period is delayed by 1 day?

If your period is delayed by one day, you can test for pregnancy. The human chorionic gonadotropin test is a urine test and is a very sensitive test. If the menstrual cycle is on the 25th, 26th, 28th or 29th day, a pregnancy test can be performed if the menstruation is delayed by one day. However, it is easy to make mistakes through urine HCG testing, and it is not easy to judge. According to the specific situation, if the menstruation is delayed, you can go to the hospital in time for blood tests. The level of human chorionic gonadotropin in the blood test can get a definite diagnosis.

However, whether the diagnosis is based on urine HCG or blood HCG, it cannot immediately distinguish whether it is an intrauterine pregnancy or an ectopic pregnancy. During pregnancy, ectopic pregnancy has a great impact on women and may even seriously endanger their lives. Be careful not to judge whether you are pregnant based solely on yourself and ignore going to the hospital for examination to avoid risks. If you just want to know whether you are pregnant, you can use a simple urine HCG pregnancy test paper for testing. It is difficult for ordinary people to distinguish, so you can wait 2-3 days before continuing to observe and further test for pregnancy. Nowadays, pregnancy test strips are very sensitive. If the menstruation is regular, many women can get relatively significant diagnosis or test results after the menstruation is delayed.

If you delay your period by one day to test for pregnancy, the accuracy may vary depending on the test method. If you use a urine pregnancy test such as a pregnancy test strip purchased at a pharmacy, the test is usually performed one day after your period is delayed, and it may also be negative, so its accuracy is not high. However, if it is a blood HCG test, its accuracy will be very high, even up to 100%, especially for women with regular menstruation.

Because about 10 days after the embryo implants, the patient can be tested for pregnancy through blood HCG testing. However, the blood HCG test can only mean that the patient is pregnant, but it cannot determine whether the patient has an intrauterine or ectopic pregnancy. If the menstruation is delayed by one day, it is usually not possible to distinguish whether the patient has an intrauterine pregnancy or an ectopic pregnancy, because even if a color Doppler ultrasound examination is performed at this time, the gestational sac is relatively small and the color Doppler ultrasound examination will be limited. Generally, the gestational sac cannot be seen from the uterine cavity just after menstruation.

Therefore, if you test for pregnancy about 1 day after menstruation, you can accurately detect that the patient is pregnant based on the blood HCG test. However, it is not possible to determine whether it is an intrauterine or ectopic pregnancy through ultrasound. It takes about 40 days after menstruation to see whether the patient has an intrauterine pregnancy from ultrasound.