Click here for more information about laboratory operations and procedures
If you have additional questions regarding this test, please call: 415-353-1667
BK virus, DNA, Quantitative, urine
|Available Stat?||No, however, if the patient needs the results rapidly contact the Virology lab at 415-353-4730 to make sure the sample is included in the next available run.|
|Test group||BK virus|
|In House Availability||Test performed 3x per week|
|Method||Quantitative Real-Time PCR|
|Container type||Urine cup|
|Amount to Collect||3 mL urine|
|Sample type||Random urine|
|Preferred volume||3 mL urine|
|UCSF Rejection Criteria||Grossly bloody specimens,
repeat sample from a patient within 5 days unless the patient has a prior positive result in which case 2 samples may be submitted within one week.
|Processing notes||Freeze urine at -70C in screw top tube. Transport to China Basin on dry ice.|
|Normal range||Not detected|
|Synonyms||BKV; Polyoma virus|
|Stability||Room temperature or refrigerated 1 day, frozen at -70C 1 month|
|Turn around times||2-5 days|
|Additional information||BK virus is linked to the development of polyomavirus-associated nephropathy in kidney transplant recipients and hemorrhagic cystitis in bone marrow transplant recipients. Quantitative viral load thresholds of 10e4 copies/mL for plasma and 10e7 copies/mL for urine have been proposed as indicative of presumptive disease. PCR has been found to have excellent sensitivity and specificity for predicting disease, making
measurements of BK viral load in urine and plasma useful for clinical monitoring and treatment of kidney transplant and bone marrow transplant recipients.
BKV copy number is determined by real-time PCR amplification of total plasma or urine DNA using primers to a segment of the VP2 gene on capsid protein of BK virus.
This assay is capable of accurate quantification from 1000 copies/mL to 1 x 10e10 copies/ml. Samples with DNA detected outside the linear range will be reported as "Detected, < 1000 copies/mL" or "Detected, > 1 x 10e10 copies/mL"..
Change in virus DNA level over time is a better indicator of clinical significance than absolute copy number.
The assay can reliably detect BKV DNA down to a lower limit of 660 copies/mL.
This test was developed and its performance characteristics determined by the UCSF Clinical Laboratories. It has not been cleared or approved by the U.S. Food and Drug Administration.
|LDT or Mod FDA?||Yes|
|Last Updated||4/17/2013 2:30:47 PM|