Vaccine information, visitor restrictions, and additional resources | Medicaid: The program is changing and you must take steps to keep your UNC Health providers

Ehrlichia IgG


Tube Type

Test ID   LAB794
EPIC Order
CPT Code(s)    
Group/Individual Test   Individual
Laboratory   Clinical Immunology
Tube Station   30
Specimen Routine: 6mL Blood/Serum Separator/Gold Top Tube; See Comments.
  micro: 2x Full Red Top Serum Separator Pediatric Bullets
Availability Routine: Once per week
Turnaround Time   1-7 Days
Reference Range Normal:
IgG: <1:64
Ehrlichia chaffeensis IgG antibodies are detected by indirect immunoflourescent assay(IFA).  Sera are screened for IgG antibodies at a 1:64 dilution. Sera collected during the first 1 to 2 weeks after onset of illness may be negative in these tests and a second serum collected 2 to 3 weeks later is recommended.  A single IgG titer >1:64 indicates exposure to E. chaffeensis.  A fourfold rise in IgG titer between acute serum and a convalescent serum collected 2 to 3 weeks later suggests recent or current infection. 

Reviewed by jcayless on December 02, 2019

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514