Skin biopsy vs. lumbar puncture for CIDP diagnosis

Hello. I have a quick question. My neurologist diagnosed me with CIDP with EMG and skin biopsy, and I receive weekly IVIg treatments. However, my friend’s neurologist is using EMG and lumbar puncture for diagnostic purposes. Why do some neurologists chose lumbar picture over skin biopsy or vice versa?

Sorry. That ‘picture’ is puncture. :))

Not really sure. I basically had an emg and a blood test and almost a spinal tap but he decided I didn't need the spinal tap that he had enough info to determine CIDP.