Table 2.

Descriptive statistics of the mobile apps (N=64) containing prenatal genetic testing information.

Characteristic and category				Value, n (%)
Type of developer
	App created by commercial companies			49 (77)
	App created by hospitals			11 (17)
	App created by non-governmental organizations			3 (5)
	Apps created by the government (ie, California Department of Public Health)			1 (2)
Operating system
	Android only			15 (23)
	iOS only			11 (17)
	Android and iOS			38 (59)
Type of prenatal genetic tests mentioned
	Amniocentesis			49 (77)
	CVSa			49 (77)
	First trimester screening (NTb screening)			46 (72)
	Triple/quad screening			44 (69)
	Cell-free DNA testing or NIPTc			35 (55)
	Anatomy ultrasound			26 (41)
	Cordocentesis			10 (16)
	Expanded carrier screening			8 (13)
	First trimester screening (blood test)			8 (13)
	Genetic screening (prenatal) in general			7 (11)
	Carrier screening			6 (9)
Prenatal genetic test procedures mentioned
	Amniocentesis			37 (58)
	CVS			36 (56)
	First trimester screening (NT screening)			34 (53)
	Cell-free DNA testing or NIPT			25 (39)
	Triple/quad screening			17 (27)
	Cordocentesis			9 (14)
	Anatomy ultrasound			5 (8)
	Carrier screening			4 (6)
	First trimester screening (blood test)			3 (5)
	Expanded carrier screening			1 (2)
	Not reported			17 (27)
Timing of prenatal genetic tests mentioned
	CVS			45 (70)
	Amniocentesis			44 (69)
	First trimester screening (NT screening)			40 (63)
	Triple/quad screening			38 (59)
	Cell-free DNA testing or NIPT			31 (48)
	Anatomy ultrasound			23 (36)
	Cordocentesis			9 (14)
	First trimester screening (blood test)			8 (13)
	Carrier screening			3 (5)
	Expanded carrier screening			1 (2)
	Genetic screening (prenatal) in general			1 (2)
	Not reported			5 (8)
Reliability or accuracy of prenatal genetic tests mentioned
	Cell-free DNA testing or NIPT			23 (36)
	Amniocentesis			21 (33)
	First trimester screening (NT screening)			13 (20)
	CVS			12 (19)
	Triple/quad screening			12 (19)
	Cordocentesis			2 (3)
	Carrier screening			1 (2)
	Expanded carrier screening			1 (2)
	First trimester screening (blood test)			1 (2)
	Anatomy ultrasound			1 (2)
	Not reported			33 (52)
Interpretation of potential results of prenatal genetic tests
	Triple/quad screening			19 (30)
	Cell-free DNA testing or NIPT			13 (20)
	Amniocentesis			12 (19)
	First trimester screening (NT screening)			9 (14)
	Expanded carrier screening			8 (13)
	CVS			8 (13)
	Carrier screening			3 (5)
	Genetic screening (prenatal) in general			1 (2)
	Not reported			36 (56)
Specific disorder(s) mentioned
	Trisomy 21 (Down syndrome)			53 (83)
	Trisomy 18 (Edward syndrome)			33 (52)
	Cystic fibrosis			29 (45)
	Trisomy 13 (Patau syndrome)			18 (28)
	Sickle cell anemia			14 (22)
	Tay-Sachs disease			11 (17)
	Spinal muscular atrophy			8 (13)
	Neural tube defect (general)			3 (5)
		Spina bifida	15 (23)
		Anencephaly	6 (9)
	Thalassemia			3 (5)
	Fragile X syndrome			2 (3)
	Huntington disease			2 (3)
	Muscular dystrophy			2 (3)
	Klinefelter syndrome			1 (2)
	Prader-Willi syndrome			1 (2)
	Trisomy 16			1 (2)
	Turner syndrome			1 (2)
	Not reported			9 (14)
Citation for prenatal genetic testing information
	No			48 (75)
	Yes (reliable source)			14 (22)
	Yes (non-reliable source)			2 (3)
Costd: $0				64 (100)
Customer ratinge, mean (SD); range				4.5 (0.6); 2.0-5.0

^aCVS: chorionic villus sampling.

^bNT: nuchal translucency.

^cNIPT: noninvasive prenatal testing.

^dFive apps had an optional upgrade fee but upgrading did not affect the amount of prenatal genetic testing information available to the user.

^eOnly 52 of the 64 apps (81.3%) had customer ratings.