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Test ID: 81107    
JC Virus (JCV) Detection by In Situ Hybridization

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Method Description Describes how the test is performed and provides a method-specific reference

The probes are labeled with digoxigenin and used in an in situ hybridization procedure with hybridization for 2 hours. After washing, the tissues are incubated with anti-digoxigenin antibody conjugated to alkaline phosphatase and the hybridization product is detected by reaction of the enzyme conjugate with the substrate 5-bromo-4-chloro-3-indolyl phosphate (BCIP) and concomitant reduction of nitroblue tetrazolium (NBT). Some bizarre, malignant-appearing astrocytes may stain with the JCV probe. These cells are infected by JCV in progressive multifocal leukoencephalopathy (PML). Morphologically, these cells have enlarged nuclei (25-60 nm), lobulated nuclei, multiple nuclei, nuclear hyperchromasia with a coarse chromatin pattern, and occasional frank mitosis. (Aksamit AJ, Mourrain P, Sever JL, Major EO: Progressive multifocal leukoencephalopathy: investigation of three cases using in situ hybridization with JC virus biotinylated DNA probe. Ann Neurol 1985;18:490-496)

Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.

Monday through Friday; 9 a.m.

Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.

1 day

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result

4 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

1 week

Performing Laboratory Location The location of the laboratory that performs the test

Rochester