The present invention relates generally to assays and methods involving Cytochrome c (Cyt c) and leucine-rich alpha-2-glycoprotein-1 (LRG), and related antibodies. In an embodiment, the invention includes a method of detecting LRG in a sample, the method including disposing Cyt c on a substrate; contacting the sample with the Cyt c; contacting bound components of the sample with an antibody or antibody fragment specific for LRG; and quantitating the amount of the antibody or antibody fragment bound to LRG. In an embodiment, the invention includes a method of purifying or enhancing the purity of LRG from a sample, the method including contacting the sample with Cyt c; forming a complex between LRG in the sample and Cyt c; removing uncomplexed components of the sample; releasing LRG from the complex with Cyt c; and collecting the released LRG. In an embodiment, the invention includes an isolated antibody produced by a hybridoma cell line (ATCC Accession Number PTA-8131), or antibody fragment thereof that specifically binds to LRG. In an embodiment, the invention includes a kit comprising an antibody that specifically binds to LRG, or a fragment thereof that specifically binds to LRG, and a compartment, wherein the antibody or fragment is contained within the compartment. Other embodiments are described herein.