IV Bags, Albutein 5% Albumin (Human) Flexbag IV Bag Solution 250 mL x 4/Box (Rx)Albutein 5% (Human) by Grifols Therapeutics is an intravenous solution of human serum albumin prepared as a sterile, preservative free solution. The 5% concentration indicates that there are 5 grams of human albumin per 100 milliliters of solution. This particular formulation is provided in a 250 mL Flexbag, which makes it convenient for administration in clinical settings. Here are its primary features and uses: Composition: Albutein 5% is a solution