A multiple layer cytometric test card comprising: a waste channel to receive biological waste liquid from an area of the test card utilized for testing biological samples; a first and a second waste storage compartment (410, 415) in a waste layer of the card for storing the waste liquid and having a top and a bottom (425, 432) in relation to an operating vertical orientation of the test card; a narrow groove formed along a vertical length of a side of the first waste storage compartment, wherein the waste channel is coupled to the groove at the top of the first waste storage compartment, and the groove is open to the first waste storage compartment along the vertical length of the side of the first waste compartment and adapted to transfer waste liquid by capillary action from the waste channel to either the bottom of the first waste storage compartment when the first waste storage compartment is empty or to a surface of waste liquid stored in the first waste storage compartment; a channel coupling the first and second waste storage compartment (410, 415) at bottoms of the first and second waste storage compartment (410, 415); an air pass coupling the first and second waste storage compartment (410, 415) to transfer air displaced by fluid filling the first waste storage compartment to the second waste storage compartment; and a second air pass coupled to the second waste storage compartment extending from the top of the second waste chamber to discharge the displaced air from both chambers to the ambient, in order to reduce backpressure otherwise resulting from filling the first and second waste storage compartments (410,415). a waste channel to receive biological waste liquid from an area of the test card utilized for testing biological samples; a first and a second waste storage compartment (410, 415) in a waste layer of the card for storing the waste liquid and having a top and a bottom (425, 432) in relation to an operating vertical orientation of the test card; a narrow groove formed along a vertical length of a side of the first waste storage compartment, wherein the waste channel is coupled to the groove at the top of the first waste storage compartment, and the groove is open to the first waste storage compartment along the vertical length of the side of the first waste compartment and adapted to transfer waste liquid by capillary action from the waste channel to either the bottom of the first waste storage compartment when the first waste storage compartment is empty or to a surface of waste liquid stored in the first waste storage compartment; a channel coupling the first and second waste storage compartment (410, 415) at bottoms of the first and second waste storage compartment (410, 415); an air pass coupling the first and second waste storage compartment (410, 415) to transfer air displaced by fluid filling the first waste storage compartment to the second waste storage compartment; and a second air pass coupled to the second waste storage compartment extending from the top of the second waste chamber to discharge the displaced air from both chambers to the ambient, in order to reduce backpressure otherwise resulting from filling the first and second waste storage compartments (410,415).