A catheter system for draining a bodily fluid from a fluid source in a body of a subject. In one form, the catheter tube has a proximal end and a distal end. The catheter tube includes a drainage lumen that extends from a proximal end opening in the proximal end to a distal end opening in the distal end. The catheter system further includes a fluid sampling component in fluid communication with the distal end opening. In some embodiments, the catheter system includes a one-way check valve. In some embodiments, the catheter system includes a balloon positioned between one or more openings.
