| Final 17:35 | time | | L | React. | | 1. Brazil | 42.85s | NR | 7 | 0.180 | | Ana Claudia Lemos Da Silva, Vanda Gomes, Franciela Krasucki, Rosangela Santos | | 2. United States | 43.10s | | 5 | 0.157 | | Kenyanna` Wilson, Barbara Pierre, Yvette Christine Lewis, Chastity Ann Riggien | | 3. Colombia | 43.44s | SB | 6 | 0.181 | | Lina Marcela Flores, Yenifer Padilla, Yomara Hinestroza, Norma Gonzalez | | 4. Cuba | 43.97s | SB | 3 | 0.160 | | Roxana Tomasa Diaz, Nelkis Teresa Casabona, Gretther Guillen, Dulaimi Debora Odelin | | 5. Canada | 44.33s | SB | 2 | 0.151 | | Kerri-Ann Mitchell, Krysia Bayley, Christian Evelyn Brennan, Angela Patricia Whyte | | 6. Ecuador | 46.18s | NR | 4 | 0.192 | | Carla Pamela Chala, Erika Benilda Chavez, Winnie Daniela Castillo, Celene Alejandra Cevallos, | | -. Jamaica | DNF | | 8 | 0.163 | | Ornella Livingston, Anastasia Leroy, Simone Facey, Yanique Ellington | | -. Mexico | DNF | | 1 | 0.215 | | Gabriela Belen Santos, Jessica Lynn Sanchez, Aydee Yesenia Villareal, Matilde Alvarez |
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| World Record: | | East Germany 41.37s | | Canberra (AUS), 06.101985 | | Panamerican Record: | | Jamaica 42.62s | | Winnipeg (CAN) 30.07.1999 |
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