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These mixtures are used for pulmonary function testing. After a patient inhales the mixture, the exhaled breath is analyzed to determine how well the lungs have diffused the Carbon Monoxide in the gas. Helium is present in the mixture to determine lung volume (very low percentages of Methane or Neon may be used in place of Helium, depending on the instrument analysis method).
More commonly used mixtures are shown here, others are available as needed.
WARNING: Administration of lung diffusion mixtures may be hazardous or contraindicated. For use only by or under the supervision of a licensed practitioner who is experienced in the use and administration of lung diffusion mixtures and is familiar with the indications, effects, dosage methods, and frequency and duration of administration, and with the hazards, contraindications, and the side effects and precautions to be taken.
CAUTION: Federal law prohibits dispensing without a prescription.
Concentration | Balance Gas | Cylinder Size | Contents (liters) | Valve Outlet CGA No. | Approximate Pressure psig @ 70°F | Approximate Ship Weight (lbs) |
| Carbon Monoxide 0.1% Oxygen 21% | Nitrogen | HP220 | 4956 | 500 | 1350 | 149 |
HP-E | 538 | 973 | 1350 | 23 |
| Carbon Monoxide 0.3% Helium 10% Oxygen 21% | HP220 | 4956 | 500 | 1350 | 149 |
HP-E | 538 | 973 | 1350 | 23 |
| Carbon Monoxide 0.3% Neon 0.5% Oxygen 21% | HP220 | 4956 | 500 | 1350 | 149 |
HP-E | 538 | 973 | 1350 | 23 |
| Carbon Monoxide 0.3% Neon 0.3% Oxygen 21% | HP220 | 4956 | 500 | 1350 | 149 |
HP-E | 538 | 973 | 1350 | 23 |
| Carbon Monoxide 0.39% Neon 0.5% Oxygen 21% | HP220 | 4956 | 500 | 1350 | 149 |
HP-E | 538 | 973 | 1350 | 23 |
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