Paralympic star Oscar Pistorius has given up hope of running at the 2008 Olympics but will continue his fight to race against able-bodied athletes.
Pistorius had his legs amputated when he was a child
Athletics governing body the IAAF ruled earlier this month that his prosthetic limbs give him an unfair advantage and contravene rules on technical aids.
"We have appealed and are busy setting things up for the testing," he said.
"But it's a massive commitment, and there won't be time to get it all done before Beijing."
The South African, who had both legs amputated below the knee as a child, runs with carbon fibre blade attachments, earning him the nickname "Blade Runner".
Pistorius was prevented from competing in China after a scientific study revealed that he used 25% less energy than able-bodied runners to run at the same speed.
We believe more tests need to be done, and the onus is on us to prove that
Pistorius's manager Peet van Zyl
The 21-year-old, who holds the Paralympic 400m world record of 46.34 seconds, spent two days in Cologne last November undergoing tests alongside five able-bodied athletes of similar ability.
But Pistorius claims the study was flawed.
"We have circulated the report to various experts in the United States and they have told us it did not take enough variables into consideration," said his manager Peet van Zyl.
"We believe more tests need to be done, and the onus is on us to prove that."