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Hcg Levels After Implantation

Hcg Levels After Implantation

About Hcg Levels After Implantation

hCG stands for "Human Chorionic Gonadotropin," the pregnancy hormone, which is produced by the placenta and which is detected in the blood within a few days after implantation. When you test at home with a pregnancy test, you actually test for the presence of hCG in the urine. If hCG is present, then the pregnancy test will be positive, and that means you are pregnant unless there is a false positive pregnancy test.

Increase Of hCG In Early Pregnancy

hCG usually doubles every 48-72 hours very early in pregnancy and every 3-4 days later on until about 9-10 weeks of the pregnancy when it levels off. There is no single "normal" hCG level during early pregnancy and there are wide ranges of normal levels which you can check with our hCG calculator.

Where does hCG come from?

hCG comes from the placenta and enters the blood soon after implantation and is detected via pregnancy tests. hCG starts to be produced by the placenta as soon as implantation occurs. This happens about one week after fertilization and ovulation when the embryo implants and the placenta attaches to the uterine lining.

How do pregnancy tests detect hCG levels and determine if you’re pregnant?

Pregnancy tests are designed to detect changes in hCG levels using a scientific technique called sandwich enzyme immunoassay, and while this sounds complicated (and the biochemistry definitely is!), the principles are about as complicated as making a peanut butter and jelly sandwich.

hCG is a large molecule made of two separate components: the alpha part and the beta part. A pregnancy test comes with antibodies (aka “bread slices”) to detect the alpha part (“the peanut butter”) and the beta part (“the grape jelly”). So, if you take a pregnancy test and are pregnant, hCG in your urine will be sandwiched by the antibodies on the stick, and this sandwiching triggers the release of a dye, creating the dark line which indicates a positive pregnant test. The second line is a control test to make sure the antibodies are working.

Positive Pregnancy Test

Implantation is first trigger for your body to start producing the hCG, (also known as the pregnancy hormone). Pregnancy tests (both home tests and blood pregnancy tests ones) look for the presence of hCG to confirm a pregnancy. Implantation must occur to for this hormone to be produced.

If implantation has not taken place, a pregnancy test cannot detect hCG and will give you a negative result. So, implantation has to occur before a pregnancy can be recognized with a pregnancy test.

Can I use an LH test for also detecting hCG levels?

Potentially, yes. The molecular structure of LH is similar to the molecular structure of hCG, which means that LH tests cannot tell the difference between LH and hCG in your urine. So, if you’ve missed your period and have a positive LH test, then it’s possible that you’re pregnant, but it would be best to confirm with a pregnancy test specifically designed to measure hCG.