Lab marker · High

High CYFRA 21-1 (lung cancer marker): what it means

A CYFRA 21-1 (lung cancer marker) result above the normal range is considered high. Here is what a raised CYFRA 21-1 (lung cancer marker) can point to, and when it is worth discussing with a doctor.

Reference range: typically <~3.3 ng/mL; a monitoring marker for non-small-cell lung cancer — used to follow known disease and treatment response, not to screen

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What a high CYFRA 21-1 (lung cancer marker) can mean

  • Non-small-cell lung cancer — the main use; higher levels reflect more active disease and are followed during treatment.
  • A rising trend in known lung cancer — can signal the disease progressing.
  • Benign lung disease — pneumonia, other lung conditions can cause modest, non-cancer rises.
  • Reduced kidney function — can raise the level independently.
  • A single mildly raised value — often non-specific and needs the trend and clinical context.

When to discuss with a doctor

CYFRA 21-1 is a specialist monitoring marker for non-small-cell lung cancer, not a screening or stand-alone diagnostic test. In someone with known lung cancer it is followed over time — a falling trend is reassuring, a rising trend prompts imaging and reassessment. Outside that setting a mildly raised value is often non-specific, from benign lung disease or reduced kidney function, and a normal value never rules cancer out. It is usually read together with other lung markers because different tumour types raise different ones. Mediora.AI can surface a CYFRA 21-1 trend and show it alongside related markers, but this needs specialist assessment — the interpretation belongs with your oncology team.

Conditions this can relate to

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.