What is a pregnancy test?
A pregnancy test is a medical diagnostic procedure used to
determine whether a female has conceived a child. There are two
broad categories of pregnancy tests: at home test and doctor office
tests. The at-home tests are pretty good, up to a 95% accuracy when
used according to the instructions on the box. They are based upon
a reaction with hCG (human choriogonadotropin, a pregnancy-specific
hormone) in the female's urine; this hormone starts to show up
within a few weeks of conception. The doctor's office tests can
either be similar to a home pregnancy test or can be a blood sample
test looking for hCG. In the second trimester of pregnancy, a
doctor can perform an ultrasound examination and identify the fetus
in the uterus.