Test Code: Rubg Preferred Name Rubella antibody

1 hour
1 day
Non-medicare Item

Test Tubes

ImageSpecimen TypeSpecimen VolumeTube Type
Blood (adult)8 mLSST with gel 8.5 mL (Dark Yellow Top)
Blood (paediatric)2 mL4x SST with gel 600 uL Paed (Red or Yellow top)
--No collection notes--

APPLICATION:  Rubella IgM antibodies becomes positive 7 days after the onset of the illness but is usually undetectable after 8 weeks.

INTERPRETATION:  A x4 fold rise in IgG titre is evidence of recent infection.
Rubella IgM in a neonate is suggestive of congenital infection but false postive and false negative results occur.
Viral Culture/Rubella PCR is a definitive method of diagnosing congential infection as the virus is present in throat, conjunctiva, blood and urine.
Viral Culture/Rubella PCR is performed at Westmead NSW.

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