The<unk>  <unk>  or<unk> AP) is a value calculated from the results of multiple individual medical lab tests. It may be reported with the results of an electrolyte panel, which is often performed as part of a comprehensive metabolic panel. The<unk>  is the quantity difference between cations (positively charged ions) and<unk> s (negatively charged ions) in serum, plasma, or urine. The magnitude of this difference (i.e., "gap") in the serum is calculated to identify metabolic acidosis. If the gap is greater than normal, then high<unk>  metabolic acidosis is diagnosed. The term<unk> " usually implies "serum<unk> ", but the urine<unk>  is also a clinically useful measure.
Anion gap
Osmol gap
Lactate threshold
Respiratory quotient
Oxygen equivalent
CO2 content
Sucrose gap
NC ratio