haematology respiratory general-medicine
Pack Years Calculator for Smoking History
Quantifies cumulative tobacco exposure. One pack year equals 20 cigarettes per day for 1 year. Used in lung cancer risk assessment, COPD staging, and LDCT lung cancer screening eligibility. NICE DG44 recommends LDCT for adults aged 55-74 with 20 or more pack years who are current or ex-smokers.
References
- NICE Diagnostics Guidance 44 (DG44). Lung cancer: LDCT screening in adults aged 55-74 at higher risk. NICE. 2023.
- Global Initiative for Chronic Obstructive Lung Disease (GOLD). Global Strategy for COPD. 2024.
Related
Curated clinical cross-links plus same-class fallbacks.
Drugs
Pathways
- Major Haemorrhage / Massive Transfusion · BCSH; RCOA; RCEM; RCS — BCSH Guidelines
- Anaemia Investigation · BSH / NICE
- Deep Vein Thrombosis Diagnosis and Treatment · NICE CG144 / NICE NG158
- Sickle Cell Crisis · BSH 2021 / BCSH
- Neutropenic Sepsis · NICE CG151 2012 / ESMO
- Anticoagulation Reversal · BSH 2016 / ESC
Decision support only — verify against MDCalc, NICE, or your local guideline before clinical use.