Characterization of circulating antibodies with affinity to an epitope used in antibody-conjugated magnetic immunoassays from a case of falsely elevated cyclosporine A.
BACKGROUND
We report a case demonstrating falsely elevated cyclosporine A (CsA) levels by using the antibody-conjugated magnetic immunoassay (ACMIA). To determine the cause of the false positive result, we examined the presence of an interferent in the patient's sample.


METHODS
A 26-year-old male patient displayed a high CsA concentration eight weeks after discontinuation of CsA treatment when measured by ACMIA. The possibility of assay interference was examined using serial dilution tests, heterophilic blocking tubes, erythrocyte washing, polyethylene glycol (PEG) protein precipitation, and a Protein A sepharose bead immunoabsorption assay.


RESULTS
The serial dilution test showed nonlinearity, suggesting the presence of an interferent. CsA concentrations in the patient's plasma pre- and post-heterophilic blocking tube treatment were similar. Erythrocyte washing and PEG protein precipitation tests indicated the existence of a protein interferent in the plasma. Moreover, the Protein A bead immunoabsorption assay identified the interferent as antibodies against a unique epitope on the monoclonal antibody-β-galactosidase (mAb-β-gal) enzyme conjugate used in CsA ACMIA.


CONCLUSIONS
We identified a circulating antibody against the unique epitope of the CsA ACMIA mAb-β-gal conjugate that induces falsely high CsA concentrations. These findings suggest that clinically aberrant CsA levels require immediate re-measurement by reference methods such as mass spectrometry.
Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.
Sunyoung
S
Ahn
Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.
Jooyoung
J
Cho
Department of Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea.
Soon Il
SI
Kim
Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.
Jisook
J
Yim
Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.
Sang-Guk
SG
Lee
Department of Laboratory Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea. Electronic address: jeongho@yuhs.ac.
Jeong-Ho
JH
Kim
D000328:Adult; D000911:Antibodies, Monoclonal / Q000097:blood* / Q000276:immunology*; D016572:Cyclosporine / Q000097:blood*; D000939:Epitopes / Q000276:immunology*; D006801:Humans; D007118:Immunoassay; D060328:Magnetic Phenomena; D008297:Male
D000911:Antibodies, Monoclonal; D000939:Epitopes; D016572:Cyclosporine
Antibody-conjugated magnetic immunoassay; Assay interference; Cyclosporine; Therapeutic drug monitoring