Final answer:
PSGN is a kidney disease caused by an immune response to a streptococcal infection. Abs in serum can be used as a diagnostic marker for PSGN by measuring the concentration of antibodies in the blood serum.
Step-by-step explanation:
PSGN stands for Post-streptococcal glomerulonephritis, which is a type of kidney disease caused by an immune response to a streptococcal infection. Abs in serum refers to antibodies in the blood serum of the patient. When someone has PSGN, they may have elevated levels of antibodies in their serum as a result of the immune response to the streptococcal infection.
This information suggests that the presence of Abs in serum can be used as a diagnostic marker for PSGN. By measuring the concentration of antibodies in the blood serum, healthcare professionals can ascertain whether the patient has PSGN or not. This can be done using a technique that involves binding the antigen (from the streptococcal infection) to the antibody, forming an Ag-Ab complex.
It's important to note that the presence of antibodies in the serum alone cannot definitively diagnose PSGN, as other factors and clinical signs need to be considered. A healthcare professional would typically use various diagnostic tests and medical history to confirm the diagnosis.