| Final | time | | L | _______ | | 1. Jamaica | 43.58s | | 7 | | 1^_ Sheri-Ann Brooks, Tracy-Ann Rowe, Aleen Bailey, Peta-Gaye Dowdie | | 2. United States | 43.62s | | 4 | | Shareese Woods, Mechelle Lewis, Alexis Weatherspoon, Mikele Barber | | 3. Cuba | 43.62s | | 3 | | Virgen Benavides, Roxana Díaz, Misleidys Lazo, Anay Tejeda | | 4. Puerto Rico | 43.81s | NR | 2 | | Beatriz Cruz, Celiangeli Morales, Jennifer Gutierrez, Carol Rodríguez | | 5. Saint Kitts and Nevis | 44.14s | | 6 | | Tanika Liburd, Desarie Walwyn, Tameka Williams, Virgil Hodge | | 6. Brazil | 44.14s | | 5 | | Thatiana Regina Ignâcio, Lucimar de Moura, Thaissa Presti, Luciana dos Santos | | 7. Trinidad Tobago | 44.33s | | 8 | | Ayanna Hutchinson, Sasha Springer-Jones, Nandelle Cameron, Fana Ashby | | 8. Colombia | DNS | | 1 |
| Heats - First 3 and Best 2 progress. |
| Heat 1. | time | | L | _______ | | 1. United States | 43.07 | | | Shareese Woods, Mechelle Lewis, Alexis Weatherspoon, Mikele Barber | | 2. Cuba | 43.46 | | | Virgen Benavides, Yenima Arencibia, Misleidys Lazo, Anay Tejeda | | 4. Puerto Rico | 44.05 | Q, | NR | | Beatriz Cruz, Celiangeli Morales, Jennifer Gutierrez, Carol Rodríguez | | 7. Trinidad Tobago | 44.16 | | | Ayanna Hutchinson, Sasha Springer-Jones, Nandelle Cameron, Fana Ashby | | 9. Bahamas | 45.13 | | | Shaniqua Ferguson, Tivanna Thompson, Tamica Clarke, Shandria Brown | | 11.Ecuador | 46.55 | | | Lorena Mina, Yessica Perea, Paola Sánchez, Erika Chávez |
| Heat 2. | time | | L | _______ | | 3. Brazil | 43.98 | | | Thatiana Regina Ignâcio, Lucimar de Moura, Thaissa Presti, Luciana dos Santos | | 5. Saint Kitts and Nevis | 44.11 | Q, | NR | | Tanika Liburd, Desarie Walwyn, Tameka Williams, Virgil Hodge | | 6. Jamaica | 44.12 | | | Tracy-Ann Rowe, Nadine Palmer, Peta-Gaye Dowdie, Elva Goulbourne | | 8. Colombia | 44.53 | | | Briggite Merlano, Felipa Palacios, Mirtha Brock, Darlenys Obregon | | 10.Chile | 45.50 | | | María Carolina Díaz, María Mackenna, Daniela Ri de Relli, Daniela Pavez |
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