Evaluation of the tacrolimus II microparticle enzyme immunoassay (MEIA II) in liver and renal transplant recipients

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Abstract

We evaluated the MEIA II with blood samples with added tacrolimus (3.0, 5.0, 11.0, and 22.0 μg/L). The assay had acceptable recoveries (99-103%) and intraday imprecision (<16.0%) across the range of concentrations studied, except for the recoveries at 3.0 μg/L (86.3%) and 5.0 μg/L (80.7%). Comparison of liver (n = 116) and renal (n = 113) patient samples measured by MEIA II against HPLC-tandem mass spectrometry (HPLC-MS/MS) found a mean overestimation of 15.6%. From these comparison data it can be calculated that at values of 5 and 20 μg/L in liver or renal transplant patient samples, measured by HPLC-MS/MS, MEIA II will have the corresponding range estimates of 3.6-7.9 μg/L and 20.925.4 μg/L, respectively. No clinically significant difference in results, in terms of overestimation or correlation, was observed between the two transplant groups studied. The MEIA II is an improvement on the previous MEIA I and is suitable for the therapeutic drug monitoring of tacrolimus where HPLC-MS/MS is unavailable.

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Cogill, J. L., Taylor, P. J., Westley, I. S., Morris, R. G., Lynch, S. V., & Johnson, A. G. (1998). Evaluation of the tacrolimus II microparticle enzyme immunoassay (MEIA II) in liver and renal transplant recipients. Clinical Chemistry, 44(9), 1942–1946. https://doi.org/10.1093/clinchem/44.9.1942

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