What is the test for determining whether loss of consciousness constitutes great bodily injury?

Whether an injury constitutes great bodily injury is a question of fact. (People v. Wolcott (1983) 34 Cal.3d 92, 107.) We will not disturb the trier of fact's determination if it is supported by substantial evidence. (Ibid.) We view the record in the light most favorable to the judgment. (People v. Pennington (2017) 3 Cal.5th 786, 800.) Loss of consciousness is a condition that qualifies as serious bodily injury. ( 243, subd. (f)(4).) Evidence of medical treatment is not necessary to prove great bodily injury. (People v. Wade (2012) 204 Cal.App.4th 1142, 1150.)