This test measures IgM antibodies to Rocky Mountain Spotted Fever.

IgM antibodies to RMSF are typically detectable within 1-2 weeks of infection.  They will typically no longer be detectable after a few months. 

Testing for RMSF is recommended for anyone who develops symptoms after being bitten by a tick or spending time outdoors in areas where ticks are prevalent. RMSF Antibody testing can sometimes show false positives due to cross-reactivity with other illnesses including Lyme Disease.

Rocky Mountain Spotted Fever (RMSF) is a bacterial disease which is spread through tick bites.

There are several common tick species which can carry this disease. RMSF was first seen in the Rocky Mountains area but is also prevalent in the southeastern US as well as parts of Canada, Mexico, Central America, and South America. Most people infected with RMSF will have symptoms which include fever, headache, nausea, vomiting, stomach pain, muscle pain, and lack of appetite. 

The signature symptom of RMSF is a rash which develops in most people who are infected, often around the wrists and ankles. The rash typically takes the forms of small red dots or red splotches and can spread up or down the body. Because most of the symptoms of RMSF are common to other conditions and the rash may not develop early in the illness, a diagnosis based just on symptoms can be difficult. 

Blood testing for RMSF antibodies is recommended.  Early diagnosis and treatment are key to a successful recovery. If left untreated, Rocky Mountain Spotted Fever can lead to nerve damage, paralysis, hearing loss, mental disability, and death.