The IgG index is a comparison between the:

Question

Quizplus · Accepted Answer

The IgG index is calculated by comparing the levels of IgG in the cerebrospinal fluid (CSF) and serum. However, since IgG can also enter the CSF through passive diffusion from the serum, the comparison needs to be adjusted for the blood-brain barrier (BBB) integrity. This is done by calculating the CSF/serum albumin index, which estimates the extent of BBB damage, and then using this value to normalize the CSF/serum IgG index, resulting in the IgG index. Therefore, the correct choice is C, which includes both the CSF/serum albumin index and the CSF/serum IgG index. Choices A, B, and D are incorrect because they only involve one of the two indices required for calculating the IgG index.

The IgG Index Is a Comparison Between The