Pack-Years
Pack-Years - a deterministic tool in Sophie Well's Clinical Math & Conversions group.
Open the Pack-Years → Runs in your browser. No signup, no tracking.
What this is
Compute cigarette pack-years from the standard tobacco-history measure: packs per day multiplied by years smoked. Sophie Well accepts fractional packs (e.g., half a pack = 0.5) and returns the integer pack-year total used in lung-cancer screening eligibility, COPD risk stratification, and surgical pre-op assessment.
When to use it
Use this when documenting a smoking history in a primary-care visit, when screening eligibility for low-dose chest CT (USPSTF 2021: age 50-80 with >=20 pack-years and current or recent smoking), or when explaining cumulative exposure to a patient. Pack-years measure cigarettes only; cigar, pipe, vape, and cannabis exposure are documented separately.
References
Standard tobacco-history measure: pack-years = packs per day x years smoked.
Worked example: Pack-years 30
Sophie Well is a reference and educational tool. Not medical, legal, or financial advice. Does not replace clinician judgment, professional billing review, or legal counsel.