Photometric Method, Magnesium（JGJ）

Siemens Healthcare Diagnostics is recalling two lots of their Dimension Vista¿ Total Magnesium (MG) Flex Reagent Cartridges (lots 24057BB and 24064BC) due to the potential for falsely low measurements of magnesium in plasma. Because the error is intermittent, existing quality control procedures may not recognize that a patients results are incorrect, and the results may be reported out

Dimension Magnesium (MG) Flex reagent cartridge lots may exhibit imprecision for Quality Control (QC) and produce Abnormal Reaction flags. The issue is not always detected by QC and erroneous results may be produced in the absence of an Abnormal Reaction flag. Based on customer data, imprecision leading to erroneous, unflagged patient results with a bias of -15 to -59% may occur

Dimension Vista Magnesium Flex reagent cartridge lots exhibiting imprecision and intermittent Abnormal Assay flags. When this issue occurs, there is a potential for QC failures or erroneous patient results which may lead to repeat and follow-up testing.

Lipemic interference for the Magnesium serum application failed to meet the performance claim as defined in the IFU. Use may cause a maximum positive bias up to 30.38% in low magnesium patient samples. The impact is only to the clinical interpretation of magnesium results in the presence of lipemia.

Failing to meet the linearity performance claims quoted on the kit inserts-The linearity is reduced by approximately -30% for Serum/ Plasma and -50% for Urine

Failing to meet the linearity performance claims quoted on the kit inserts-The linearity is reduced by approximately -30% for Serum/ Plasma and -50% for Urine

Abbott internal testing has identified that the Magnesium urine application demonstrates depressed urine result recovery. All samples >0.5mEq/L fail the linearity acceptance criteria for the bias specification and demonstrate depressed recovery of up to 37%. The specific cause of the negative bias/depressed results is currently under investigation.

According to the firm, Carry over was observed when the amylase or pancreatic amylase test is run directly before or after the Magnesium assay. An update is required to the RX Imola analyser running order and an acid wash recommended when setting up the magnesium assay. A correction was made to the IFU for the Magnesium assay and all RX Imola customers in the USA were contacted with the updated instruction.

Erroneous low results on a small number of reagent wells. There is the potential for under-recovery on certain wells for quality control (QC) and patient sample results. The under-recovery ranged from -0.3 mg/dL [0.12 mmol/L] to -1.6 mg/dL [0.66 mmol/L]; equivalent to a maximum negative bias of -88%.

Horiba Medical is recalling the ABX PENTRA Magnesium RTU Reagent because the on-board stability claims has been updated. Horiba has updated the ABX PENTRA Magnesium RTU package inserts by removing the 7-day on-board stability claim and replacing it with a 1-day on-board stability claim.

Ortho Clinical Diagnostics is recalling Slide Dispense cartridges used with some VITROS Chemistry Product Slides due to slide dispense issues.