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To view specimen requirements and codes please select your laboratory:

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Bacterial Identification, Phenotypic and Sequencing

Test Code


CPT Code(s)


Preferred Specimen(s)

Culture isolate on an agar slant in a double-walled container

Collection Instructions

Mixed cultures will not be accepted. Subculture isolate to the appropriate slant and submit in double-walled container.

Transport Container

Agar slant double-walled container

Transport Temperature

Room temperature

Specimen Stability

Room temperature: Determined by viability
Refrigerated: Determined by viability
Frozen: Unacceptable

Reject Criteria

Mixed cultures • Cultures shipped frozen


16S Sequencing

Setup Schedule

Set up: Tues,Thur; Report available: 3 days

Clinical Significance

This test uses genotypic methods for identification of esoteric clinical isolates. Organisms requiring extensive identification beyond simple routine methods are sequenced. DNA sequencing involves the sequencing and analysis of the 16S ribosomal RNA gene to identify bacteria to the genus level or below.

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
BACIDBacterial IDPending 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.