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The two primary methods are testing for the female pregnancy hormone (human chorionic gonadotropin (hCG)) in blood or urine using a pregnancy test kit, and scanning with ultrasonography. [1] Testing blood for hCG results in the earliest detection of pregnancy. [2] Almost all pregnant women will have a positive urine pregnancy test one week ...
When doctors speak about pregnancy, they're referring to the 40 weeks after the start of your last period, so your menstrual cycle is actually considered part of the process.
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.
Home pregnancy tests are urine tests, and normally detect a pregnancy 12 to 15 days after fertilization. [81] A quantitative blood test can determine approximately the date the embryo was fertilized because hCG levels double every 36 to 72 hours before 8 weeks' gestation.
Kelley Kitley, 45, thought her family was complete with two sons and a daughter. Then, after realizing she was a few days late getting her period, she took a pregnancy test.It was positive. "I was ...
Human chorionic gonadotropin is a glycoprotein composed of 237 amino acids with a molecular mass of 36.7 kDa, approximately 14.5kDa αhCG and 22.2kDa βhCG. [4]It is heterodimeric, with an α (alpha) subunit identical to that of luteinizing hormone (LH), follicle-stimulating hormone (FSH), thyroid-stimulating hormone (TSH), and a β (beta) subunit that is unique to hCG.
The combination of a positive pregnancy test and the presence of what appears to be a normal intrauterine pregnancy does not exclude an ectopic pregnancy, since there may be either a heterotopic pregnancy or a "pseudosac", which is a collection of within the endometrial cavity that may be seen in up to 20% of women. [5]
Urine-based pregnancy tests detect hCG in the urine, while blood-based pregnancy tests measure the level of hCG in the blood. [5] The presence of hCG in a woman's body indicates that a fertilized egg has implanted in the uterus and the placenta has started to form. 10 days after fertilization, significant hCG can be detected from woman's blood ...