What does G1P0 mean?

• A. One pregnancy and no births at twenty weeks or more
• B. One birth and no pregnancies
• C. Zero pregnancies and zero births
• D. One pregnancy and one birth

Answer: (A)

Gravida counts how many times a person has been pregnant, while parity (often shown as the number after reaching viability) counts how many pregnancies have reached a viable gestational age and resulted in a birth. Viable birth is typically considered around 20 weeks or more.

So G1P0 means there has been one pregnancy and none of those pregnancies reached the threshold for a birth at or beyond 20 weeks. This can happen if the pregnancy ended before viability (a miscarriage or abortion) or if the pregnancy is ongoing and has not yet reached 20 weeks. It does not mean there were zero pregnancies, just zero births at 20 weeks or more. If there had been a birth after 20 weeks, the parity would be at least 1 (for example, G1P1).