An extension assembly for a catheter comprises an extension tube, an extension connector, and an indicator assembly. The extension tube has a proximal end and a distal end. The extension tube further has an inner bore and an opening placing an interior of the extension tube in fluid communication with an exterior of the extension tube. The extension connector is coupled to the proximal end of the extension tube. The indicator assembly is comprised of a sealing member, a wicking member, and an indicator. The sealing member including a first side and a second side. The wicking member includes a wicking tab to be disposed within the opening of the extension tube. The indicator is in fluid communication with the wicking member. The sealing member is at least partially clear to allow visual inspection of the indicator once the indicator assembly is coupled to the extension tube.