B  

Routine work-up for recurrent mid-trimester pregnancy loss focuses on antiphospholipid antibody testing (lupus anticoagulant, anticardiolipin/β2-glycoprotein-I) and genetic evaluation of the conceptus; infectious screening such as VDRL for syphilis in either partner is not included because syphilis is not an established cause of recurrent miscarriage and universal antenatal screening already occurs separately [Giouleka 2023 PMID 37263963; Chaturvedi 2017 PMID 28784423].