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Reagent Storage, Stability & Handling
AutoPure Magnesium is ready-to-use, single liquid reagent system.
Stable till the expiry date indicated on the label, when stored at 2-8C.
On-Board Reagent Stability
Components & Concentration of Working Solution
Specimen Collection & Preservation
Fully automated system automatically calculates the Magnesium concentration of each sample.
Refer to application sheet for details. For additional system applications, contact our local Accurex representative.
For calibration, it is recommended to use C.f.a.s* or any other suitable calibrator material.
Re calibration is recommended
Each batch ofAutoPure Magnesium is assayed with atleast six quality control sera Precinorm, Precipath, Biorad 1 Biorad II Accutrol Normal and Accutrol Abnormal prior to release.
If the control values fall outside the specified limits, each of the below criteria should be cross - checked and corrected:
1.8 -2.6 mg/dl ( 0.74-1.-0 mmol/l)
1.9 - 2.5 mg/dl ( 0.78-1.03 mmol/l)
1.5 - 2.3 mg/dl ( 0.62-0.95 mmol/l)
1.2 -2.6 mg/dl ( 0.49 - 1.07 mmol/l)
Expected range varies from population to population. It is therefore recommended that each laboratory should establish its own normal range. For diagnostic purposes, the magnesium results should always be assessed in conjunction with the patient's medical history, clinical examinations and other findings.
Performance Characteristics Linearity
With AutoPure Magnesium, the assay is linear upto 5 mg/dl (2.06 mmo1/1). Determine samples with higher concentrations via the rerun function. On instruments without rerun function, manually dilute samples with higher concentrations using 0.9% NaCI or distilled/deionized water (e.g. 1 + 4). Multiply the result by the appropriate dilution factor (e.g. 5).
There is no significant interference in samples containing upto 60 mg/dl of bilirubin. Haemolysis interference is observed since magnesium is released from erythrocytes.
Reproducibility was determined using quality control sera as shown below:
Quality Control Material
Low Control Serum
High Control Serum
Co - Relation Studies
A comparison of the magnesium determination using AutoPure Magnesium and reference reagent gave the following co-relation (mg/dl):
No. of samples measured : 62
The sample concentrations measured were between 1.5 and 5.2 mg/dl.