Table 2.

Proportion of Pregnancy Episodes with Prenatal Screening Procedure Codes During Pregnancy^a

Pregnancy Endpoint	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017
First-trimester ultrasound
Full term	34.1	35.0	37.2	39.0	39.9	41.1	43.0	43.6	43.6	45.1	46.1
Preterm	41.3	42.4	44.2	45.1	46.3	48.1	50.7	50.1	50.0	51.0	52.0
Posttermb	37.8	37.2	38.6	39.7	42.9	44.9	43.2	45.2	44.7	43.6	46.4
Ectopic	28.2	29.7	32.0	31.2	35.0	35.3	38.6	41.2	40.5	38.7	40.8
Still birth	40.8	42.5	47.1	45.7	46.4	47.8	49.9	49.3	49.1	51.9	55.5
Induced abortion	16.8	18.0	19.2	20.3	21.4	19.5	19.2	20.0	19.2	20.8	20.6
Spontaneous abortion	26.6	28.0	28.2	28.2	28.9	28.9	29.9	30.1	29.6	29.9	29.7
Unknown outcome	11.5	12.7	11.9	13.0	13.4	13.2	13.8	13.1	14.1	20.3	19.3
Nuchal translucency measurement
Full term	7.1	19.7	24.8	29.1	31.7	32.6	34.3	33.4	31.9	31.3	32.5
Preterm	9.8	23.2	28.5	33.1	35.6	37.2	38.8	37.6	35.8	35.4	35.0
Postterm	8.4	26.6	32.3	32.7	35.7	39.4	38.0	41.2	36.5	33.7	34.7
Pregnancy-associated plasma protein A (PAPP-A)
Full term	12.7	17.8	22.8	26.9	29.8	31.3	30.3	26.1	20.9	18.8	17.8
Preterm	14.9	19.9	25.2	29.4	32.2	34.4	32.5	27.7	22.6	19.9	18.4
Postterm	18.2	24.4	29.7	32.0	33.0	38.1	36.1	34.3	24.0	21.4	21.1

^aNotes: ^aThe numbers in the table are reported as the percentage of pregnancies with the procedure during pregnancy. ^bPostterm includes pregnancies with a gestational age of more than 41 weeks.