KING OF PRUSSIA, Pa.--(BUSINESS WIRE)--CSL Behring announced today that the U.S. Food and Drug Administration (FDA) has approved a supplemental Biologics License Application (sBLA) to extend the shelf life of Hizentra®, Immune Globulin Subcutaneous (Human), 20% Liquid, from 18 months to 24 months. Hizentra, the first and only 20 percent subcutaneous immunoglobulin (SCIg) approved in the U.S. by the FDA, is also the first and only SCIg in the U.S. that may be stored at room temperature.