The Magnetic Resonance Imaging (MRI) Scanner is a device that detects the magnetic features of water in different types of cells in the body.
This test uses a CAT scanner to measure the amount of calcium in the coronary (heard) blood vessels. It has very good validity in predicting the degree of coronary artery disease (CAD, plaque). It can be a substitute in some cases for a stress test and/or angiography.
The only downsides is that the CAT scanner uses a good amount of radiation. Also the test is not covered by most insurances, costing ~ $200.
This molecule is a protein made by the liver in response to certain triggers. By virtue of the word reactive, this value will go up in the face of immune stimulation, such as by certain infections and certain allergies.