Lung cancer tumour marker blood test

Tumour markers are substances that may be released by cancer cells or by the body in response to cancer. A result can be affected by conditions other than cancer, and some lung cancers do not release a marker that can be measured. Doctors therefore interpret the result alongside symptoms, scans, examination findings and, when needed, a biopsy. A blood test may also be used to check general health before treatment.

Ask which marker is being measured and what decision the result could influence. Check whether you need any preparation and how the result will be reported. If lung cancer has already been diagnosed, ask whether blood findings will be combined with tissue or genomic testing when treatment is selected. Do not delay an imaging appointment or biopsy because a blood result is reassuring.

Arrange prompt medical review for worsening breathlessness, chest pain, coughing blood, persistent fever, unexplained weight loss or a new hoarse voice. Seek emergency care for severe breathing difficulty, fainting, sudden confusion or heavy bleeding. A blood marker result does not determine the urgency of these symptoms.

Why is this marker being tested? What can a high or low result tell us? Could another condition affect it? Do I also need imaging, a biopsy or genomic tumour profiling? When will the result change my care plan?