Laboratory tests include complete blood count , blood glucose, ammonia, creatinine, electrolytes and various hormones.  Test for certain infections like hepatitis, syphilis are done.
Encephalopathy laboratory findings
Cyanosis laboratory findings
Epilepsy laboratory findings
Peripheral neuropathy laboratory findings
Cardiomyopathy laboratory findings
Ischemic stroke laboratory findings
Infectious disease laboratory findings
Coma laboratory findings