Capillary groove for isobaric waste entry

A method comprising:

• receiving waste liquid at a capillary coupled along and open to a length of a waste compartment in a multiple layer cytometric test card;
• drawing the waste liquid into the capillary via capillary action;
• transporting the waste via the capillary toward a bottom of the waste compartment;
• exiting the waste from the capillary into the waste compartment when surface tension of the waste liquid in the capillary is overcome.

A method comprising;

• forming a waste chamber in a layer of a multiple layer cytometric test card for insertion into a test instrument in a predetermined orientation;
• forming a groove proximate the waste chamber creating a capillary that is open to the waste chamber along a length of the waste chamber;
• and
• forming a waste channel to couple to the groove and the waste chamber to provide liquid waste that enters the capillary via capillary action and travels in the capillary down the length of the waste chamber, entering the waste chamber when surface tension is overcome.