Prenatal tests, for short

• OB/GYNs perform them
• Tests done by OB-GYNs
• Tests done by OBs
• OB's perform them
• Prenatal procedures, informally
• Prenatal procedures performed by OBs
• Some pregnancy tests, for short
• Thin innermost membranous sac enclosing the developing embryo in higher vertebrates (Amniota reptiles

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Amnios \Am"ni*os\, n. Same as Amnion . [1913 Webster] ||

Wiktionary Word definitions in Wiktionary
n. (context anatomy English) amnion