pinging your health should also display shield HP beside it.
i was playing a game as galio and noticed when my passive came up , and i pinged my health it would display my HP percentage as usual but ignored my shield HP , which gave me an additional 300 or so HP in the later game. this would apply to champions like blitzcrank with his passive galio malphite with his passive and the countless other champions that have a shield ability. a shield in the late game can last a good amount of time by leagues standards , i think being able to ping that while you might only be at 15% hp , you also have a 300HP shield that can make up for it.