Antigen Excess Testing
Overview
Theory of Operations
IMMAGE 800 Operations Manual A11403
Page 3-8
September 2016
Antigen Excess Testing
Overview
Antigen excess (AGXS) testing is only necessary for some IMMAGE 800 protein
reagents.
Immunoglobulin G (serum IGG, urine IGU), Immunoglobulin A (IGA),
Immunoglobulin M (IGM), Kappa (KAP), Lambda (LAM), Haptoglobin (HPT), Urine
Transferrin (TRU), Alpha-1-Microglobulin (A1M), Microalbumin (MA) and Albumin
(ALB) which are identified by the system as ambiguous, are tested for antigen excess
condition if AGXS testing is enabled. (Refer to CHAPTER 5,
System Setup
,
Configuring Antigen Excess Testing.) A reaction is ambiguous if the rate response
could represent either an antigen excess or an antibody excess reaction.
Antibody Excess
When the reaction is to the left of the optimal antibody-antigen proportions (center
line), the reaction is in antibody excess (AbXS). (Refer to Figure 3.7.) This indicates
all the antigen in the sample is bound, forming complexes. This is the ideal condition
for the reaction to take place.
Antigen Excess
When the reaction is to the right of the optimal antigen-antibody proportions (center
line), the reaction is in antigen excess (AGXS) and the rate response will start to
decrease due to excessive levels of antigen. (Refer to Figure 3.7.)