The conventional laboratory ABG method uses sensor technology for pH, pCO2, pO2, sodium, potassium, calcium, glucose and lactate levels. It measures hemoglobin concentration via spectrophotometry methodology at a set wavelength of 467-672 nm. The blood gas laboratory uses ABL90 Flex (Radiometer®). The optical system is based on a 138-wavelength spectrophotometer with a measuring range of 467-672 nm. The spectrophotometer is connected via an optical fiber to a combined hemolyzer and measuring chamber.