Medical treatment systems, methods, and apparatuses using a plurality of fluid lines

A volumetric standard cassette for calibration of a cassette based pumping system, the volumetric standard cassette comprising:

• a midbody which is completely solid and includes a first face and opposing second face;
• a plurality of solid pump chamber regions, each having a predefined geometry selected to be representative of a particular pump chamber fill volume of a fluid handling cassette for use with the cassette based pumping system;
• and
• a number of walls extending from at least the first face of the midbody and including a peripheral wall located at a peripheral edge of the midbody as well as a number of interior walls, each of the solid pump chamber regions being surrounded by one of the number of interior walls.

A cassette analog of a disposable pumping cassette for calibration of a cassette based pumping system, the cassette analog comprising:

• a midbody having a first face and opposing second face;
• a number of sealing ribs on at least the first face;
• and
• a first pump chamber region and a second pump chamber region, each of the first and second pump chamber regions having a defined dimensionally stable geometry representative of a particular pump chamber fill volume of a fluid handling cassette for use with the cassette based pumping system;
• wherein the first face and opposing face are open faced and the cassette analog is incapable of pumping fluid and the midbody is completely solid.