Tested Working

pregnancy tests working on female urine or blood?

Why does a simple pregnancy test have to use female urine to detect whether the female is pregnant or not? What does the urine have to contain in order to read a plus sign? I also realize that taking blood tests also has the capability of saying you're pregnant or not. What does the blood have to contain in order to also say that you're pregnant? What are you suppose to notice? Also, please answer this question seriously.
also, I don't really want to have kids. I'm just curious.

Because during a pregnancy, the female body will secrete a hormone HCG ( this only is elevated when a woman is pregnant). Based on the concentration of this hormone, it can be detected by a urine test. The hormone is excreted or released into the blood, the blood is cleansed by the kidneys but, the HCG hormone remains in the urine. The concentration ( strength) of the hormone is stronger after a woman has missed, at least, one period. After that, it continually increases as the pregnancy progresses. Seldom, there are times, when a urine test will show a weak positive result. Or,if a person has missed more than one period and the urine test still returns negative then, the blood test will be done. The concentration of an elevated HCG hormone is tested from the blood. This is usually more accurate in those women that have a weak,positive urine test. Both, the urine and blood test, measure the levels of the HCG hormone. I hope that this helps.

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