What is the gold standard for laboratory confirmation of a mumps case?

Mumps immunity: Two sets of blood tests will have to be performed in order to confirm the development of mumps disease. As is usual with other viral illnesses, mumps antibody (igm and igg) levels are performed during the first week of the illness (acute stage) and again about 4-6 weeks later during the recovery period. The IgM confirms that the infection is due to current mumps; the IgG level confirms immunity.