|Values are valid only on day of printing.|
As an adjunct in the diagnosis of ehrlichiosis
In seroepidemiological surveys of the prevalence of the infection in certain populations
See Acute Tick-Borne Disease Testing Algorithm in Special Instructions.
See individual unit codes
Serology for IgG may be negative during the acute phase of infection but a diagnostic titer usually appears by the third week after onset.
A positive immunofluorescence assay (titer > or =1:64) suggests current or previous infection. In general, the higher the titer, the more likely the patient has an active infection. Four-fold rises in titer also indicate active infection.
Previous episodes of ehrlichiosis may produce a positive serology although antibody levels decline significantly during the year following infection.
Performance characteristics have not been established for hemolyzed or lipemic specimens.
Fishbein DB, Dawson JE, Robinson LE: Human ehrlichiosis in the United States, 1985 to 1990. Ann Intern Med 1994;120:736-743