Assessment of tacrolimus and creatinine concentration collected using Mitra microsampling devices.

Abstract:

BACKGROUND:Current practice requires regular venous blood samples for monitoring of tacrolimus concentrations post renal transplant requiring regular hospital visits. Mitra devices use volumetric absorptive microsampling technology and absorb a fixed amount of blood (10 μL) from a capillary blood sample. They are a viable volumetric alternative to dried blood spots and are able to be posted to the laboratory for analysis. OBJECTIVE:The aim was to develop and validate liquid chromatography-tandem mass spectrometry (LC-MS/MS) assays for tacrolimus and creatinine analysis using Mitra devices. The usefulness of this approach was assessed in renal transplant patients routinely monitored for tacrolimus and creatinine. METHOD:Routine tacrolimus samples were used to assess the utility and reliability of Mitra sampling. Shared sample preparation for both tacrolimus and creatinine was carried out in a 96-deep well plate; mass spectrometric analysis was then undertaken for tacrolimus followed by re-injection for creatinine analysis. RESULTS:Comparison of 131 Mitra samples with a routine LC-MS/MS assay for tacrolimus showed a minimal bias -5.6% (95% CI -8.5 to -2.7%). Comparison of 135 serum and Mitra samples for creatinine using a fully validated LC-MS/MS assay showed a bias -6.5% (95% CI -8.5 to -4.5%). DISCUSSION:We have developed assays for tacrolimus and creatinine on fingerprick blood using the Mitra device and believe this approach provides a viable alternative to repeated venepuncture for therapeutic drug monitoring. This method could open up the opportunity for patients to perform tacrolimus and kidney function monitoring at home.

journal_name

Ann Clin Biochem

authors

Marshall DJ,Kim JJ,Brand S,Bryne C,Keevil BG

doi

10.1177/0004563220948886

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

389-396

issue

5

eissn

0004-5632

issn

1758-1001

journal_volume

57

pub_type

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