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Immunoassays involve the use of antibodies to detect something. The antibodies are used as "sniffing dogs" that seek out a particle and alert you to its presence. Immunoassays
http://www.ehow.com/facts_5962014_hiv-general-bloo...
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Blood tests can show the ranges of different things that are in your blood. From here if something it low or high would tell the doctor what other tests would need to be run to diagnose
http://answers.ask.com/Health/Diseases/what_do_blo...
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A blood pregnancy tests can be take 7 days after you ovulate and can show the results as early as 6-8 days.This is when the levels of hCG is visible in the blood.
http://answers.ask.com/Health/Reproductive/how_soo...
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You may have asked yourself, what happens to your blood after you leave the donation center? First of all your blood is tested for any features that may make it useless to the blood
http://www.ehow.com/how-does_4578798_give-blood-te...
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