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An early pregnancy test can read positive as soon as 11-15 days after conception, 1 day after a missed period An early pregnancy test can read positive as soon as 11-15 days after conception, 1 day after a missed period. However, more accurate results can be obtained 2 days after a missed period. A home pregnancy test detects the presence of human chorionic gonadotropin (hCG), which is produced in a pregnant woman. Traces of hCG can be seen in urine 3-4 days after the fertilized egg implants in the uterus, and the amount doubles every 48 hours. When there is enough hCG in the body, a pregnancy test can detect it and produce a positive result. If your periods are irregular, however, and your test result is negative, you should repeat a home pregnancy test after 1 week. How accurate are home pregnancy tests?Home pregnancy tests are quite reliable and usually 99% accurate. However, it is critical to carefully follow the instructions on the package.
Here is how the tests work:
What can cause a false-positive pregnancy test result?In rare cases, a false-positive outcome can be caused by:
Other reasons for a false-positive result include:
SLIDESHOW16 Early Signs & Symptoms of Pregnancy: Could You Be Pregnant? See SlideshowWhat tests are done to confirm pregnancy?In addition to false-positive results, a home pregnancy test may show a false-negative result, especially if you tested too early or if the kit was defective. In order to confirm the results of a home pregnancy test, talk to your doctor to undergo additional tests. Your doctor may order urine or blood tests:
If pregnancy is confirmed, an abdominal ultrasound can be done to assess the development and health of the fetus. When should you see a doctor?Regardless of your pregnancy test results, consult your doctor if you develop any of the following symptoms:
If your home pregnancy test result is positive, you should see your doctor to both confirm the pregnancy and begin prenatal care. Health NewsMedically Reviewed on 3/8/2022 References Image Source: iStock Images American Pregnancy Association. What is HCG? https://americanpregnancy.org/getting-pregnant/hcg-levels/ Betz D, Fane K. Human Chorionic Gonadotropin. [Updated 2021 Aug 11]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2022. https://www.ncbi.nlm.nih.gov/books/NBK532950 Memon N. How Soon Will a Pregnancy Test Read Positive? MedicineNet. https://www.medicinenet.com/how_soon_will_a_pregnancy_test_read_positive/article.htm How long does pregnancy test show positive?You can carry out most pregnancy tests from the first day of a missed period. If you don't know when your next period is due, do the test at least 21 days after you last had unprotected sex. Some very sensitive pregnancy tests can be used even before you miss a period.
Can a pregnancy test show positive if it sits too long?If you let the test sit too long the the test may show a false positive result. A false positive is when the tests shows you are pregnant when you actually are not. Pregnancy tests work by detecting a hormone called human chorionic gonadotropin, HCG. A hormone is chemical produced in your body.
Do pregnancy test results disappear?A 'Pregnant' (positive) result will remain on the display for up to 6 months. A 'Not Pregnant' (negative) result will remain on the display for approximately 24 hours.
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