In 39 cases with falsely elevated CgA, spontaneous normalization was observed between CgA measurements pre- and post-referral and in 19 cases comorbidity was identified as a possible cause of increased levels of CgA (renal dysfunction n = 10; heart disease n = 4; chronic atrophic gastritis n = 1, multimorbidity n = 4). Here, CGA is linked to gastritis.