Interference with Creatinine Assay by IgM-λ Monoclonal Protein in Lithium Heparin Blood Collection Tube from a Malignant Lymphoma Patient

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Nobuyasu Yukimasa
Wataru Oboshi
Keisuke Hayashi
Hiroko Kuribayashi
Ryuichi Uzawa
Kunihiko Fukuchi
Takehiro Nakamura

Abstract

Aims: Analytical interference in the clinical laboratory is a well-known phenomenon. When analyzing samples containing monoclonal immunoglobulins (M proteins), various problems could be encountered in the clinical laboratory data.

Presentation of Case: The authors report a patient with false elevated plasma creatinine concentration due to interference of monoclonal IgM in a routine test for creatinine determination. In the present case the interference might be caused by M protein precipitation, due to an increased turbidity and an apparent increase of absorbance in the clinical chemistry creatinine assay. Sia water test can provide a first clue to M protein aggregation; confirmation can be obtained by observing the time/absorbance curves of the analysis. When a Sia water test was performed with changes in the salt concentration, protein aggregation occurred at a higher salt concentration for the lithium (Li)-heparin plasma sample than the serum.

Discussion and Conclusion: These results suggested that the M protein of this patient, when interacted with Li-heparin, is more readily insolubilized. Subsequently, a reaction reproduction experiment was performed by adding the M protein component roughly purified to Li-heparin blood collection tubes. These results might support the aggregation of the M protein of this patient in the reaction solution due to its interaction with Li-heparin.

Keywords:
Creatinine measurement, lithium (Li)-heparin plasma, monoclonal immunoglobulin (M protein), Sia water test.

Article Details

How to Cite
Yukimasa, N., Oboshi, W., Hayashi, K., Kuribayashi, H., Uzawa, R., Fukuchi, K., & Nakamura, T. (2016). Interference with Creatinine Assay by IgM-λ Monoclonal Protein in Lithium Heparin Blood Collection Tube from a Malignant Lymphoma Patient. International Journal of Medical and Pharmaceutical Case Reports, 8(1), 1-7. https://doi.org/10.9734/IJMPCR/2016/29258
Section
Case Study