Laboratory Studies
The diagnosis of tetanus is based entirely on clinical findings. Tetanus is unlikely if a reliable history indicates the completion of a primary vaccination series and the receipt of required booster doses.
Wounds should be cultured in suspected cases. However, C tetani can be cultured from wounds of patients without tetanus and frequently cannot be cultured from wounds of patients with tetanus.
The leukocyte count may be high.
Cerebrospinal fluid examination yields normal results.
Serum antitoxin levels of 0.01 or higher are considered protective and make tetanus unlikely, although rarely cases have been reported despite the presence of protective antitoxin levels.
Serum muscle enzyme levels (eg, creatine kinase, aldolase) may be elevated.
Other Tests
Electromyography may show continuous discharge of motor subunits and shortening or absence of the silent interval normally observed after an action potential.
Nonspecific changes may be evident on electrocardiography.
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| History of Absorbed Tetanus Toxoid | Clean Minor Wounds | All Other Wounds | ||
| Tetanus-diphtheria-acellular pertussis | TIG | Tdap | TIG | |
| Unknown or < 3 doses | Yes | No | Yes | Yes |
| 3 or more doses | No | No | No | No |

