Adjective confirming has 2 senses

• confirming(a = adj.all) positive - indicating existence or presence of a suspected condition or pathogen; "a positive pregnancy test"
• confirming(s = adj.all) collateral, confirmative, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying - serving to support or corroborate; "collateral evidence"