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. 2020 May 29;74(2):91–97. doi: 10.1136/jclinpath-2020-206668

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Number of sequential tests positive for epidermal growth factor receptor (EGFR) T790M by ddPCR and time interval following initial blood test. (A) The percentage of EGFR T790M positive or negative/inconclusive follow-up tests performed on any sequential blood specimens, reflex tissue biopsy and reflex tissue cytology specimens at 30-day intervals following an initially negative or inconclusive blood test. (B) The percentage of EGFR T790M positive or negative/inconclusive tests performed on only the subset of patients with available sequential blood specimens at 30-day intervals following an initially negative or inconclusive blood test.