| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS | 
|---|---|---|---|---|---|---|
| 1 | 1 | 1 | JAM | Jamaica | 
 JAM                 | 
                42.50 Q WL | 
| 2 | 1 | 2 | USA | United States | 
 USA                 | 
                42.63 Q SB | 
| 3 | 2 | 2 | TTO | Trinidad and Tobago | 
 TTO                 | 
                42.87 Q SB | 
| 4 | 1 | 3 | BRA | Brazil | 
 BRA                 | 
                42.94 Q SB | 
| 4 | 2 | 1 | CAN | Canada | 
 CAN                 | 
                42.94 Q SB | 
| 5 | 3 | 1 | NGR | Nigeria | 
 NGR                 | 
                43.56 q SB | 
| 6 | 2 | 3 | GBR | Great Britain & NI | 
 GBR                 | 
                43.60 Q SB | 
| 7 | 3 | 3 | SUI | Switzerland | 
 SUI                 | 
                43.68 q SB | 
| 8 | 4 | 1 | BAH | Bahamas | 
 BAH                 | 
                44.11 SB | 
| 9 | 4 | 3 | ECU | Ecuador | 
 ECU                 | 
                44.24 SB | 
| 10 | 5 | 3 | KAZ | Kazakhstan | 
 KAZ                 | 
                44.27 SB | 
| 11 | 3 | 2 | PUR | Puerto Rico | 
 PUR                 | 
                44.35 SB | 
| 12 | 4 | 2 | VEN | Venezuela | 
 VEN                 | 
                44.42 SB | 
| 13 | 5 | 2 | CHN | PR of China | 
 CHN                 | 
                44.45 SB | 
| 14 | 6 | 2 | SWE | Sweden | 
 SWE                 | 
                44.81 SB | 
| 15 | 6 | 3 | AUS | Australia | 
 AUS                 | 
                45.17 | 
| 16 | 5 | 1 | IRL | Ireland | 
 IRL                 | 
                45.38 SB | 
| 1 | GER | Germany | 
 GER                 | 
                DNF | ||
| 1 | POL | Poland | 
 POL                 | 
                DNF | ||
| 2 | ITA | Italy | 
 ITA                 | 
                DNF | ||
| 3 | FRA | France | 
 FRA                 | 
                DNF | ||
| 3 | JPN | Japan | 
 JPN                 | 
                DQ R170.7 |