Athletics at the 2010 South American Games – Women's 4 × 400 metre relay explained

See main article: Athletics at the 2010 South American Games. The Women's 4x400m Relay event at the 2010 South American Games was held on March 23 at 18:55.

Medalists

width=200 bgcolor=gold	Gold	width=200 bgcolor=silver	Silver	width=200 bgcolor=CC9966	Bronze
Yaneth Largacha María Alejandra Idrobo Marcela Cuesta Yenifer Padilla	Barbara Leoncio Elaine Paixão Ana Claudia Silva Barbara de Oliveira	María Ayelén Diogo Agustina Zerboni Juliana Menéndez María Florencia Lamboglia

Standing records prior to the 2010 South American Games
World record	3:15.17	Seoul, South Korea	1 October 1988
World Leading	3:36.21	Kingston, Jamaica	27 February 2010
South American record	3:26.82	Helsinki, Finland	13 August 2005
South American U23 record	3:40.05	Barquisimeto, Venezuela	27 June 2004

Results were published.

Rank	width=150	Athlete !	width=100	Nationality !	width=100	Reaction !	width=100	Result !	Notes
	Yaneth Largacha María Alejandra Idrobo Marcela Cuesta Yenifer Padilla		0.388	3:40.09
	Barbara Leoncio Elaine Paixão Ana Claudia Silva Barbara de Oliveira		0.294	3:40.68
	María Ayelén Diogo Agustina Zerboni Juliana Menéndez María Florencia Lamboglia		0.260	3:51.74
–	Carla Cavero Alison Sánchez Marysabel Romero Leslie Arnez		0.219	DSQ	^†

^†: Bolivia was initially 3rd in 3:51.04, but disqualified, because Alison Sánchez was tested positive for nandrolone.