The provided reference discusses general blood tests for patients suspected of having Guillain-Barré Syndrome (GBS). However, it doesn't specify a definitive laboratory test for GBS itself. Therefore, based solely on the provided context, the answer is:
General lab tests like complete blood counts, glucose, electrolytes, kidney function, and liver enzyme tests are conducted on patients suspected of GBS, but these aren't specific diagnostic tests for GBS. Diagnosis of GBS involves a combination of clinical findings and certain laboratory tests.
The reference specifically mentions that testing is guided by differential diagnosis.
Therefore, more information is needed to provide the correct and specific answer to what the laboratory test is for GBS.
