I have patient who delivered a twin pregnancy at term. Should I note her in her chart to be a para 1 or para 2?

Para OR Parity is the number of completed pregnancies beyond 20 weeks gestation (whether viable or nonviable). The number of fetuses delivered does not determine the parity.

A woman who has been pregnant once and delivered twins after 20 weeks would be noted to be a Gravid 1 Para 1.

REFERENCES
1. Cunningham FG. ed Williams Obstetrics, 22nd ed.,  New York: McGraw-Hill.2005 Opara EI, Zaidi J.
2. The interpretation and clinical application of the word 'parity': a survey. BJOG. 2007 ;114(10):1295-7.PMID:17877683
3. Mark Morgan and Sam Siddighi. NMS Obstetrics and Gynecology(National Medical Series for Independent Study).2004 p 45