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In general, it's best to wait until you've missed your period, and to take the test first thing in the morning. Learn how timing impacts accuracy from experts.
False negative readings can occur when testing is done too early. hCG levels rise rapidly in early pregnancy and the chances of false negative test results diminish with time (increasing gestational age). [24] Less sensitive urine tests and qualitative blood tests may not detect pregnancy until three or four days after implantation. [25]
A pregnancy test detects the presence of the pregnancy hormone human chorionic gonadotropin in a person’s body. The body doesn’t produce that hormone until several days after conception.
Blood and urine tests can detect pregnancy by 11 and 14 days, respectively, after fertilization. [78] [79] Blood pregnancy tests are more sensitive than urine tests (giving fewer false negatives). [80] Home pregnancy tests are urine tests, and normally detect a pregnancy 12 to 15 days after fertilization. [81]
There are three purposes of prenatal diagnosis: (1) to enable timely medical or surgical treatment of a condition before or after birth, (2) to give the parents the chance to abort a fetus with the diagnosed condition, and (3) to give parents the chance to prepare psychologically, socially, financially, and medically for a baby with a health problem or disability, or for the likelihood of a ...
If I am right there should be no need to add 3 or 4 days. and it should be kept in mind that the levels double in about 2 days. In the article the accuracy is not talked about, I assume it is an accurate quantitative blood test (beta-HCG serum level). So, I think it is maximum 17 days not 21 days after intercourse that tests can show pregnancy.
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