Calibration and qc results were acceptable.
All frozen specimens are mixed well and centrifuged after thaw and prior to analysis.
There was no hemolysis, icterus or lipemia observed.
The customer stated that the electrophoresis plate and band that reads 13% is directly following the mm band and clearly not migrated to the mb location.
The customer is requesting whether there may be interference/lack of specificity in the presence of ck macro with the atellica im ckmb assay.
The interpretation of results section in the instructions for use (ifu) states: "serial sampling at the appropriate time intervals will result in the typical rise and fall pattern of ck-mb levels in patients experiencing myocardial infarction.
Elevated ck-mb levels may be related to non-ami events such as congestive heart failure, strenuous exercise, or trauma.
These events should be considered when interpreting ck-mb results.
" "results of this assay should always be interpreted in conjunction with the patient's medica history, clinical presentation, and other findings.
" the limitations section in the ifu states: "patient samples may contain heterophilic antibodies that could react in immunoassays to give falsely elevated or depressed results.
This assay is designed to minimize interference from heterophilic antibodies.
16,17 additional information may be required for diagnosis.
" siemens healthcare diagnostics is investigating.
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