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A meta-analysis published in 2011 found that such tests are reliable more than 98% of the time, as long as they are taken after the seventh week of pregnancy. [1] [2] Chorionic villus sampling (CVS) and amniocentesis are two rather invasive testing procedures. These may, in principle, be performed as early as the 8th and the 9th week of pregnancy.
Medical providers often struggle to 'rule out' pregnancy for medical testing or treatment that cannot be conducted during pregnancy before they can do an accurate urine pregnancy test. [ 27 ] More rare, false negative results can also occur due to a " hook effect ", where a sample with a very high level of hCG is tested without dilution ...
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.
The hCG test can be used to screen for uterus cancer, or a molar pregnancy, which is when there is abnormal placental growth in the uterus. [9] The hCG test can also be done after a miscarriage to ensure that a molar pregnancy is not present. In men, the hCG test can be used to screen for the presence of testicular cancer. [9]
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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] A quantitative blood test can ...