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To view specimen requirements and codes please select your laboratory:

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Nitroblue Tetrazolium (NBT)

Test Code


CPT Code(s)


Preferred Specimen(s)

3 mL whole blood collected in sodium heparin (green-top) tubes. Maintain at room temperature. Specimen is only stable 24 hours and test must be performed within 24 hours of collection. A control tube must be drawn if collected outside of National Jewish Medical Center.
Prior to specimen collection, this test must be scheduled with National Jewish Lab (303-398-1344) to ensure appropiate staffing and availability for this assay.

Alternative Specimen(s)

Lithium heparin (green-top) tube

Transport Container

Sodium heparin (green-top) tubes

Transport Temperature

Room temperature


This assay is used for clinical purposes and was developed and its performance characteristics determined by National Jewish Clinical Reference Laboratories.
It has not been cleared or approved by the US Food and Drug Administration. The FDA has determined that such clearance or approval is not necessary., This laboratory is certified under the Clinical Laboratory Improvement Admendments of 1988 (CLIA-88) as qualified to perform high complexity clinical laboratory testing.

Reference Range(s)

95-100% of Neutrophil Reducing NBT

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
19021NITROBLUE TETRAZOLIUM (NBT)Pending assignment

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.