A320
Physiological - Other
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
When [I] reported to aircraft prior to boarding; I was alerted of strong odor by copilot & FA (Flight Attendant) #4. #2 was onboard; Captain was in cockpit. Maintenance was called and  aircraft put out of service. Copilot said he was seeking medical. 3 of us FAs met with medical. It took us hours to get approval from insurance & transportation etc. We got tested for carbon monoxide at Hospital approximately 3 & 1/2 hours after exposure. Yet the test was positive for carbon monoxide poison. Doctor told us the normal highest is 1.5; I tested 2.0; #4; 2.1; #2; 2.3.
A320 Flight Attendant reported strong odor during preflight resulting in Maintenance taking aircraft out of service. First Officer and three flight attendants received medical treatment.