A naturally occurring estrogen hormone produced in large amounts during pregnancy, sometimes called the 'pregnancy hormone'.
From 'estrin' plus the chemical suffix '-ol', indicating an alcohol compound. Named because it was identified as one of the three main estrogens and has a specific chemical structure.
Doctors can measure estriol levels in pregnant women to check fetal health—unusually low levels can indicate Down syndrome, making it one of the most important prenatal screening tests.
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