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J320
J320 – A-a oxygen gradient measurement
OHIP Pulmonary Function Studies Code — PULMONARY FUNCTION STUDIES · Schedule of Benefits
A-a oxygen gradient is a diagnostic pulmonary function study that measures the difference between the alveolar concentration of oxygen and the arterial concentration of oxygen. The procedure requires the measurement of the respiratory quotient (RQ) by sampling mixed expired gas and using the alveolar air equation. This service is comprised of a technical component ('H' Fee) and a professional component ('P' Fee), which are billed for separately. The technical component is not payable outside a hospital setting. (Source: , ).
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