In this department, it's mostly automated. But it uses only one machine, the great ADVIA Centaur Immunoassay System, by Bayer HealthCare.
Subject title: Immunology
Topic: ADVIA Centaur
Taken from http://www.blockscientific.com/advia-centaur-chemistry-analyzer.htm
The Centaur, as it is affectionately known to all my collegues, is an automated immunoassay analyzer which uses direct chemiluminescence as its principle technique. Chemiluminescence is actually a term to describe the emission of light from a chemical reaction in the sample that is being analyzed.
In the Centaur, acridinium ester (AE) is used as the chemiluminescence label. It was found out that AE is preffered and used as it does not require any addition of catalyst or substrate. It also cause the reaction to occur more rapidly, increase assay sensitivity and allow a longer reagent shelf life due to its dimethyl form.
OK, so in the Centaur, the AE is oxidized by hydrogen peroxide. The acidic environment is changed to basic in order to maximise the amount of light emitted. In this case, oxidation occurs super fast with its peak amount emitted in less than a second. This light is then measured to give the results for the sample that is being analyzed.
The Centaur can analyze for many constituents found in the blood, such as tumour markers ( CA 125, CA 199 ), thyroid stimulating hormone, Hepatitis A & B surface antigens or antibodies, cortisol, ferritin, testosterone, folate, vitamin B12, and many more. The most which is tested is for HIV.
The blood received from various clinics are centrifuged for 10minutes before they are labelled and barcoded. The tests to be done on the sample can either be pre-specified by the LIS or done manually.
Once the tests are selected, they are put in test-tube racks before they are inserted into the machine. Once all the samples are taken, the completed test-tube rack are pushed out while the samples are incubated and undergo the various tests. Its as simple as that, and that is done manually.
Those which are controlled by the LIS are just placed in the Sample Manager. The rest are fully automated, from selecting the right test-tube, to allocating the test-tube to the correct Centaur by the transportation track, to doing the various tests on its own, to going back into the Sample Manager after its all done. All the med techs have to do is to make sure everything runs smoothly, and validate the results.
Fantastic machine ain't it?
So that's all for now. Another week to get fully acquainted with the Centaur before I'm posted to another department.
Have fun for all your SIP!!!!
Name: Mayafirhana
Class: TG02