Pregnancy tests in dogs will search for the presence of the Relaxin hormone in the blood. Relaxin is produced by the developing placenta in dogs, and is usually able to be detected in the blood as soon as 3 weeks post breeding. For eager dog owners, this can be a way to determine pregnancy before the embryos are able to be seen on ultrasound.
A blood test for hCG can detect pregnancy with more than 99 percent accuracy as early as one week after conception. A qualitative pregnancy blood test simply looks for any hCG in your bloodstream to confirm pregnancy. [3] A quantitative blood test measures the exact amount of hCG in your system.How do pregnancy tests work? When you take a pregnancy test, it’s looking for the amount of human chorionic gonadotropin (HCG) in your body. You can find HCG in your pee or blood. HCG needs time to build up in your body. Each day of early pregnancy, your body will create more HCG.
The control window antibodies are designed to recognize the dyed antibodies and bind to them. This causes the dye to create a “control line,” proving that the antibodies are active and the test is working as it should. So in this test, two lines make a positive pregnancy test while one line makes a negative.
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