Axis-Shield are the global patent holders for Homocysteine immunoassays. First launched in 1995, the Axis-Shield assay is still the only EIA method available for labs without access to automated instruments.
Each kit comes complete with all required reagents and calibrators. A control pack is also available from Axis-Shield.
Axis Homocysteine EIA Reagent kit (96 Well) - FHCY100
Axis-Shield Homocysteine Control Kit (3 x 1.5mL) - FHCY200
The Axis® Homocysteine Enzyme Immunoassay (EIA) is intended for the quantitative determination of total L-homocysteine in human serum or plasma. The device can assist in the diagnosis and treatment of patients suspected of having hyperhomocysteinemia and homocystinuria.
The Axis-Shield Homocysteine Enzyme Immunoassay (EIA) is an enzyme immunoassay for the determination of homocysteine (Hcy) in serum or plasma. Protein-bound Hcy is reduced to free Hcy and enzymatically converted to S-adenosyl-L-homocysteine (SAH) in a separate procedure prior to the immunoassay.
The calibrator range is from 2 to 50 µmol/L.
Precision of the Homocysteine EIA assay was evaluated according to CLSI Protocol EP5. Three levels of controls were assayed for 20 days with 4 replicates per run at each level. Precision data are summarised in Table 1.
Table 1: Precision
|Samples||Average µmol/L||Within Run Precision||Total Precision|
Limit of Quantification:
The quantification limit (CV < 20%) is 1.0 µmol/L.
Linearity of diluted plasma samples:
If the homocysteine concentration of a sample exceeds the range of the calibration curve, the sample should be diluted with Reagent A and reanalysed.
The linearity was evaluated by diluting four high patient samples with varying amounts of Reagent A as diluent.
Linear regression analysis gave:
Correlation coefficient: r2: 0.99
The Axis® Homocysteine Enzyme Immunoassay (EIA) was compared to the University of Bergen HPLC method. A comparison of 164 patient samples ranging from 3-37µmol/L homocysteine gave the linear regression shown below.
Intercept: -0.09 µmol/L
Correlation coefficient: (r2): 0.94
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A pioneering organisation focused on the development and manufacturing of important and innovative in vitro diagnostic tests for use in clinical laboratories and at the point of care.
As a general marker of overall health status, few tests carry greater predictive weight than Homocysteine. The amount of Homocysteine in your blood is one of the best independent indicators of how healthy you are.