Uyanik, MetinSertoglu, ErdimSerdar, Muhittin A.Aydin, Fevzi N.Ozgurtas, TanerKurt, Ismail2023-02-212023-02-212014-01-0110.20344/amp.5250https://hdl.handle.net/11443/1981http://dx.doi.org/10.20344/amp.5250Introduction: Serum carbohydrate associated antigen (CA19-9) is widely used marker in clinical practice and shows small increases in a few benign diseases. Here we report two cases, a mother and her daughter with slightly elevated CA19-9 levels not accompanied by any clinical pathology. Case Presentation: The mother with elevated CA19-9 level (89.90 U/mLupper limit of normal range (ULNR) < 37 U/mL) was referred to our department for evaluation. Similar increase was determined in her daughter incidentally. Daughter's CA19-9 level was 123.92 U/mL. Extensive laboratory data, imaging procedures and clinical evaluations were within the normal ranges except elevated CA19-9 levels for both. Also, any pathology compatible with the elevated CA19-9 level couldn't be determined. In order to avoid laboratory errors and interferences, we measured the samples at four different immunoassay platforms twice. Conclusion: Healthy people can be in excess of the ULNR. Therefore, clinicians need to be aware of these rare situations without missing the malignant disordersCA-19-9 AntigenFamilyTumor Markers, BiologicalArticleWOS:000344417100022