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Pituitary hCG: While hCG is produced by the placenta, sometimes, it is also produced by your pituitary gland in your brain. The pituitary gland secretes various hormones that help to control your endocrine organ systems (such as reproductive organs, thyroid, pancreas and more). The pituitary gland secretes three other hormones (the thyroid stimulating hormones, the luteinizing hormone and the follicle stimulating hormone), which are very similar to the hCG hormone. If your hCG is indeed secreted by the pituitary gland, the levels will not increase the way they do if you are pregnant.
Pregnancy blood hCG levels are not recommended for testing the viability of the pregnancy when the hCG level is well over 6,000 and/or after 6-7 weeks of the pregnancy. Blood hCG levels are useless for testing the viability of the pregnancy if the hCG level is well over 6,000 and/or after 6-7 weeks days of the pregnancy. In general, after 6-7 weeks the best indication of a healthy pregnancy is a good fetal heartbeat. Instead of the hCG, after 6 weeks or an hCG above 6,000 mIU/cc the health of the pregnancy can best be confirmed with a sonogram to confirm the presence of a fetal heart beat. Once a fetal heart beat is seen, the hCG levels don't tell you much more about the pregnancy viability.