One variation of a method for triggering blood cell salvage for a patient includes: processing a first photographic image of a canister to estimate a content of a blood component within the canister; processing a second photographic image of a gauze sponge to estimate a content of the blood component in the gauze sponge; estimating an aggregate salvageable blood component content for the patient based on the estimated content of the blood component within the canister and the estimated content of the blood component in the gauze sponge; and in response to the estimated aggregate salvageable blood component content exceeding a threshold salvageable blood component content, generating a prompt to salvage the blood component from fluid within the canister and from the gauze sponge.