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LUNGS & BREATHINGLow-dose CT: who shouldand shouldn’t1USPSTF 2021: aged 50–80, ≥20 pack-years,current smoker or quit <15 years → yearly2NLST: in heavy smokers, LDCT cut lung-cancermortality by 20% (relative)3The cost: 24% of scans positive, 96% of thoseturn out not to be cancer4Overdiagnosis is about 18% of detected cancers5Never-smokers without family history: norandomised trial shows lower mortality6LDCT uses no contrast — no direct effect onkidney functionTaiwan’s public programme also covers family history — checkthe Health Promotion Administration for criteria. Quittingbeats any screening.BBeyond CKDbeyondckd.com/en/cards/who-should-get-ldctSources: NLST · USPSTF 2021 · 2026-10-17Compiled from public clinical guidelines · General education, not individual medical advice
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Lungs & breathing

Low-dose CT: who should and shouldn’t

Annual LDCT lung-cancer screening for everyone? The evidence only supports high-risk groups.

  1. 1USPSTF 2021: aged 50–80, ≥20 pack-years, current smoker or quit <15 years → yearly
  2. 2NLST: in heavy smokers, LDCT cut lung-cancer mortality by 20% (relative)
  3. 3The cost: 24% of scans positive, 96% of those turn out not to be cancer
  4. 4Overdiagnosis is about 18% of detected cancers
  5. 5Never-smokers without family history: no randomised trial shows lower mortality
  6. 6LDCT uses no contrast — no direct effect on kidney function

Taiwan’s public programme also covers family history — check the Health Promotion Administration for criteria. Quitting beats any screening.

Caption (ready to paste)

Annual LDCT lung-cancer screening for everyone? The evidence only supports high-risk groups.

1. USPSTF 2021: aged 50–80, ≥20 pack-years, current smoker or quit <15 years → yearly
2. NLST: in heavy smokers, LDCT cut lung-cancer mortality by 20% (relative)
3. The cost: 24% of scans positive, 96% of those turn out not to be cancer
4. Overdiagnosis is about 18% of detected cancers
5. Never-smokers without family history: no randomised trial shows lower mortality
6. LDCT uses no contrast — no direct effect on kidney function

Taiwan’s public programme also covers family history — check the Health Promotion Administration for criteria. Quitting beats any screening.

Sources: NLST — Reduced lung-cancer mortality with LDCT — N Engl J Med 2011; USPSTF 2021 — Screening for lung cancer
Verified: 2026-10-17

Cards and scripts are general health education compiled from public clinical guidelines. They are not individual medical advice and do not replace assessment by your doctor, pharmacist or dietitian. Please keep the sources and this notice when sharing; this page holds the latest version.
https://beyondckd.com/en/cards/who-should-get-ldct
60-second short-video script

Shot list and voice-over. Vertical 9:16; put captions in the lower third. Every line maps to the sources on the left.

secScreenVoice-over
0–5CT scannerShould you get a low-dose CT every year?
5–25USPSTF criteriaUS guidance: aged 50 to 80, 20 pack-years, still smoking or quit under 15 years ago — once a year.
25–4524% positive → 96% falseNLST cut lung-cancer deaths by 20%, but a quarter of scans were positive and 96% of those were not cancer.
45–60Never-smoker question markFor never-smokers, no randomised trial shows yearly LDCT helps. Family history? Talk to your doctor.

Sources (every point on the card maps to one)

Verified: 2026-10-17