Laboratory Confirmation of Diagnosis should be performed by the state public health laboratory or the CDC.
Appropriate clinical samples for testing at public health laboratories include: blood, sputum or tracheal washings, needle aspirate(s) from swollen lymph nodes, and CSF
Transport and packaging of clinical specimens must be coordinated with local and state health departments
Public health laboratories have the capacity to report preliminary results within 4 hours while laboratory confirmation may take days.
http://ideha.dhmh.md.gov/IDEHASharedDocuments/botulism.pdf accessed May 16, 2011.