The Piccolo® Electrolyte Reagent Disc, used with the Piccolo Blood Chemistry Analyzer or the Piccolo xpress™ Chemistry Analyzer, is intended to be used for the in vitro quantitative determination of chloride, potassium, sodium, and total carbon dioxide in heparinized whole blood, heparinized plasma, or serum. The tests on this panel are waived under CLIA ’88 regulations. If a laboratory modifies the test system instructions, then the tests are considered high complexity and subject to all CLIA requirements. For CLIA waived labs, only lithium heparin whole blood may be tested. For use in moderate complexity labs, lithium heparinized whole blood, lithium heparinized plasma, or serum may be used