Which of the following laboratory tests would be selected to assess the integrity of the blood-brain barrier?

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The IgG index is determined by comparing the IgG levels in CSF and plasma with albumin levels in CSF and plasma.The index may be increased by an increased leakage of IgG and albumin across a damaged blood-brain barrier (as in some infections).This index is normalized by comparing IgG levels with albumin levels in the CSF and serum.Spinal fluid albumin is derived from the blood, because synthesis of albumin occurs only in the liver, and all CSF albumin results from diffusion into the CNS.

Which of the Following Laboratory Tests Would Be Selected to Assess