A woman in her 40s is reported to be in 'stable' condition following the car crash in Hanworth yesterday (27) afternoon.
The female who is believed to have been a front seat passenger in one of the two cars involved in the collision was airlifted to Royal London Hospital in serious condition.
Her condition has since improved.
Four other people including a young girl, two women and one man, were taken to West Middlesex Hospital for minor injuries.
Police said two vehicles were involved in the road traffic collision on Tuesday at 3.33pm at the junction of Hampton Road West, Uxbridge Road and Hounslow Road.
A police spokesman said: "London Ambulance Service, London Fire Brigade and London's Air Ambulance attended and transported a female front-seat passenger from one of the cars - aged in her 40s - to an central London hospital. Her condition has been assessed as stable.
"Hampton Road West was closed and re-opened at 7.53pm.
"Police enquires continue."
A London Air Ambulance spokeswoman confirmed the patient treated by their paramedics was an adult female.
"Our advanced trauma team was dispatched by helicopter at 3.36pm to a road traffic collision in the TW13 area. Once stabilised on scene, the patient was transferred to The Royal London Hospital by air."