Diagnostic Test Directory

Virology Laboratory

Rubella virus IgG serology - serum specimen

  • LIS Mnemonic: SRBI


    Gold (SST - Clot activator & gel)

    Volume Required

    2 ml blood

    Minimum Required

    1 ml serum


    Room temperature


    If multiple viral serologies are being requested from the same specimen, the general rule is to collect a total of 2-4 ml of blood for every 2-3 tests ordered. A single serum specimen is required to determine the immune status of an individual or to test for viral-specific IgM antibodies. Paired sera specimens, collected two to three weeks apart, are required for the diagnosis of a current or recent viral infection when examining specimens for IgG antibody. Obtain the acute phase serum as soon as possible after the onset of illness. The most useful results are obtained by submitting acute and convalescent phase sera together to be tested simultaneously. Evaluation of serum for antibodies to TORCH (Toxoplasma, Rubella, CMV, HSV, etc) agents can be used to detect congenital and perinatal infections in newborns. Two serum specimens should be submitted for testing; one from the mother and the other from her infant. Serological testing is not usually available for body fluids other than serum. However, in patients with viral neurologic disease, cerebrospinal fluid (CSF) may be tested for viral antibody if paired with a serum specimen from the same date.

Days Performed



Same day

Reflex Testing





Enzyme Immunoassay


<0.9 - No rubella virus IgG antibody detected 0.9-1.10 - Equivocal for rubella virus IgG antibody >1.10 - Positive for rubella virus IgG antibody

Reference Values

Negative or no rubella virus IgG antibody detected

Search Lab Test Directory

Search by disease or test name

View a full list of all lab tests

Contact Us

Ask for more information about our laboratory services.