Gram-negative rod identification - Culture

Laboratory Fee Schedule

Procedure #: MAA0032A

CPT: 87077

Synonym(s): GNR, non-enteric, non-fermentative rods
Requisition Form G-2B
Test Description Identification of gram-negative, nonfermentative and non-enteric fermentative rods from reference culture.
Pre-Approval Needed N/A
Supplemental Information Required N/A 
Supplemental Form(s) N/A
Performed on Specimens from (sources) Human
Sample/Specimen Type for Testing

Pure isolate

Minimum Volume/Size Required

At least one viable colony

Storage/Preservation Prior to Shipping

Room temperature or refrigerated. 

Transport Medium

Appropriate medium that supports growth

Specimen Labeling
  • Two patient-specific identifiers required (e.g., patient full name, date of birth, medical record number
  • Identifiers on specimen must exactly match submission form.
Shipping and Specimen Handling Requirements
  • Ship according to Dangerous Good Regulations, IATA, and/or CFR 49.  
  • Ship specimens overnight Monday-Thursday to avoid weekend deliveries. 
Method Bacterial culture, MALDI-TOF (Mass Spectrometry) 
Turn-around Time 3-21 days.
  • Material must be viable.
  • Improper storage or shipping temperatures limit organisms' recovery
Common Causes for Rejection
  • Insufficient quantity
  • Unacceptable specimen type or source
  • Improper shipping conditions
  • Expired media or collection container
  • Discrepancies between specimen label and submission form
  • Incomplete or missing submission form
Additional Information If Brucella or Francisella sp. is suspected, notify the biothreat lab and submit with G-27A form.