Oxphos™ gives a linear response for mammalian cells (0; 100,000; 200,000; 400,000; 600,000; and 800,000) plated in 1mL growth medium in a six well plate with up to 15% fetal bovine serum and measured 20 hours after plating. It also gives a linear response for human blood (0, 10, 20, 40, 60, 80, 100 µL) suspended in a total volume of 200 µL saline in a microfuge tube and incubated with 10 µL of reagent 6 for 2hrs. Oxphos™ contains enough reagents for 100 assays using a 6-well plate.