A pregnancy test measures a hormone called human chorionic gonadotropin (HCG). HCG is a hormone produced during pregnancy. It appears in the blood and urine of pregnant women as early as 10 days after conception.
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A pregnancy test may be performed using blood or urine. There are two types of blood pregnancy tests:
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Source: National Cancer Institute
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Source: HealthCentral Encyclopedia
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Source: Breastcancer.org
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