The full Warren County Commission will be considering a measure this month that could generate revenue for its ambulance service without increasing the cost to transport patients.Under review will be a three-year contract with AMB, a national ambulance and EMS full-service billing and revenue enhancement firm that specializes in billing and obtaining payment for services. The service charge will be 5.75 percent per month of its net collection.According to EMS interim director Preston Denney, the company promises to collect enough additional revenue to pay for its services. “They guarantee us a 5.75 percent increase in collections,” said Denney.