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Test Code BKV PCR U BK Virus PCR Quant, Urine

Biohazard Infectious

Clinical System Name

BK Virus PCR Quant, Urine


BK Virus PCR Quant Urine


BK Virus DNA is detected via nucleic acid amplification. Quantitative nucleic acid detection assays offer analytic sensitivity to detect infection at an early stage before clinically significant disease occurs.  The quantitative nature of these assays also allow threshold levels that can be used to monitor or begin treatment.


The sample may be shared with other Viral PCR tests. For blood plasma, see BK Virus PCR Quant. For Bone Marrow or other tissue, see BK Virus Qualitative PCR Assay. Please forward requests for BK Virus PCR Quant Urine to the Microbiology Laboratory.

Sample Requirements

Specimen: Urine

Container: Sterile Screw Capped Container

Preferred Vol: 10 mL

Minimum Vol: 5 mL


Urine with preservative is unnacceptable. 


Processing Instructions

CPA: Send sample to Microbiology. The sample may be shared with other Viral PCR tests but cannot be shared or added on to samples that have been run through any analyzer. Microbiology may split sample prior to testing if multiple tubes are not collected for Virology and other testing.


Off-site collection: Transfer urine to a plastic aliquot tube. Store at -20C. Keep specimen frozen during transport.


Temp Time
Room temp 2 hours
Refrigerated 24 hours
Frozen 7 Days



STAT Performed TAT
N T, W, and F 24 - 72 hours

This test is performed Tuesday and Friday only at 5am. It is not available for STAT testing. 

Performing Laboratory

Seattle Children's Laboratory



Microbiology Laboratory

CPT Codes


Reporting Information

Final Report: 24 -72 hours


Reference Ranges

Result Interpretation
None Detected Negative
1 - 499 Copies/mL See Comment*
≥500 Copies/mL Positive

* BKV: The limit of quantitative detection (the minimum virus level that gives a positive result in 95% of replicates) is 500 copies/mL (or 2.7 log cp/mL). Quantitative results less than 500 copies/mL (or 2.7 log cp/mL) are described as very low positive. The clinical significance of very low positive results is uncertain and should be individually analyzed with clinical discretion.