Blood gases, arterial

Alphabetical Test listing

Blood gases, arterial-198

Blood gases, arterial
Arterial blood gases

Blood gas testing is used to evaluate respiratory diseases, conditions that affect the lungs, determine the effectiveness of oxygen therapy, and provide information about the body's acid / base balance, which can reveal important clues about lung and kidney function and the body's general metabolic state.

Lithium heparin (Li hep) whole blood, arterial
2.0 mL
  • Submit entire specimen
  • Sample should be free of air bubbles
  • Specimen must be tested within 30 minutes of collection

Lithium heparinized (Li hep) syringe without needle


Time sensitive

Refrigerated - 30 minutes

  • Vacutainer collection tubes submitted for blood gas analysis cannot be sent through the Pneumatic tube system (PTS)
  • Improper labels (unlabeled or mislabeled)
  • Hemolysis (some procedures)
  • Improper anticoagulant or ratio
  • Delay in transport
  • Improper storage temperature affecting results
  • Improper container
  • Leaking container resulting in compromised specimen
  • Quantity not sufficient (QNS)
AHL - Chemistry: C
1 day

Ion Selective Electrodes


See report


Blood gasmeasurements determine the acidity (pH) of the blood, and how much oxygen and carbon dioxide the blood contains. The pH of the blood depends on the relationship of the components of the bicarbonate buffer system – bicarbonate and carbonic acid. Carbonic acid is proportional to the dissolved carbon in the blood (0.03 × pCO2).

The plasma bicarbonate concentration is controlled mainly by the kidneys and is affected by the end products of metabolism of cells. It is referred to as the metabolic component. pCO2 is controlled by the rate of excretion of CO2 by the lungs. It is referred to as the respiratory component.

A low pH (acidosis) may be due to a fall in the HCO3- (metabolic acidosis) or a rise in pCO2 (respiratory acidosis). The body responds to a change in one component by producing a similar change in the other. This is called compensation, and is usually incomplete.