Gravidity and parity - Wikipedia
https://en.wikipedia.org/wiki/Gravidity_and_parity
OverviewParity in medicineGravidity in biologyGravidity in human medicineParity in biologyRecording systemsCriticismIn human medicine, parity is the number of pregnancies carried by a female for at least 20 weeks (duration varies from region to region, 20 – 28 weeks, depending upon age of viability). If a female carries the fetus to viable age, even if ultimately the fetus is born deceased, this still counts as an instance of parity, as parity is based on the time of gestation prior to a birth, and not the status of the offspring once born.
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