Spirogram

A spirogram is the graph or tracing produced during a breathing test (spirometry) that shows how much air you move in and out of your lungs and how fast. It plots air volume against time and gives doctors specific numbers, like FVC (total air exhaled) and FEV1 (air exhaled in the first second), that describe how well your lungs are working.

Origin

From the Greek speirein (to breathe, related to spirare in Latin) and gramma (something written). The technique was developed by John Hutchinson in the 1840s when he built the first practical spirometer and coined the term "vital capacity."

Significance in Asbestos Context

For people with asbestos-related disease, the spirogram is one of the most important tools for documenting how the disease is affecting your breathing. Asbestosis and diffuse pleural thickening typically produce a restrictive pattern on the spirogram, reduced lung volumes with preserved or increased airflow ratios, while coexisting smoking damage may add an obstructive pattern. These numbers matter both medically (guiding oxygen therapy, treatment decisions, and disability evaluations) and legally, because impairment ratings used in many asbestos claims and workers' compensation cases are calculated directly from spirogram values such as FVC and FEV1.

Example Sentence

Her pulmonologist compared the new spirogram with one from three years earlier and noted a steady decline in FVC consistent with progressive asbestosis.

Related Terms

Spirometry, Pulmonary Function Test (PFT), FVC, FEV1, DLCO, Restrictive Lung Disease, Asbestosis

Notes

• Ask for copies of every spirogram and the full PFT report, not just a summary, and keep them in chronological order; serial comparisons are powerful evidence of disease progression.
• Make sure the report lists both measured values and percent-predicted values (adjusted for age, sex, height, and race/ethnicity), since impairment ratings depend on the predicted comparisons.
• A spirogram alone cannot distinguish asbestosis from other causes of restriction; ask whether DLCO (diffusing capacity) and lung volume testing were also done, as these add important detail.
• Effort matters: if you were fatigued, in pain, or coughing during the test, tell the technician and ask whether the result was marked as acceptable and reproducible per ATS/ERS standards.
• If you smoke or have COPD, a mixed pattern on the spirogram does not rule out asbestos-related disease. Ensure your physician documents the asbestos contribution separately.