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Lab Test Details


Neisseria meningitidis Serogroup

Updated

5/2/2023 (reviewed 1/30/2025)

Search Terms

N. meningitidis Serogrouping
How to Order

On the General Microbiology Test Request Form (OHA0060), in the “Serotyping” section, check the “Neisseria meningitidis serogroup” box.

For confirmed primary specimens from sterile sites tested using culture-independent diagnostic tests (CIDTs) approved for submission to the OSPHL:

  • On the OSPHL General Microbiology Test Request Form (OHA0060), in the “Referral Testing/Send-Outs” section, write in the test request under “CDC Referrals.” 
  • In the “Specimen/Isolate Information” section, indicate “Yes” for “Was an original test performed on a CIDT platform.” Indicate platform and attach your lab’s reports. 
  • A completed CDC 50.34 form is also required for this test request.
Availability

All clients

PerformedDaily on regular business days
Time to ReportingFor isolates submitted: Within 4 working days after receipt of specimen
For primary specimens previously tested on CIDT platforms and sent to CDC: Up to 5 weeks from receipt at the CDC laboratory
CPT Code

86403 x5



Specimen Collection Details

Collection

Actively growing isolated organism from a normally sterile site, in pure culture, on an agar slant or plate media.

Primary specimens from sterile sites can be accepted if previously tested using CIDTs and approved to send to the OSPHL for forwarding to the CDC for forwarding to the CDC for referral testing.

Optimal Volume

N/A

Minimum Volume

N/A

Handling

Seal tube or plate and place into biohazard bag.

Store specimens at refrigerated temperatures (2-8°C) or room temperatures (20-25°C) pending transport.

Primary specimens from sterile sites should be frozen pending transport.

Transport

Package specimens to maintain room temperatures or refrigerated temperatures during transport, to be delivered to the OSPHL within 24 hours after culture.

Transport primary specimens from sterile sites at frozen temperatures on dry ice.

Rejection CriteriaSamples from non-sterile specimen sources or sites.
Specimens are subject to the requirements of the OSPHL Specimen Submission Policy (pdf).
Comments Culture isolates submitted for testing is retained for 7 calendar days after receipt at the laboratory.

Specimens received more than 48 hours after culture may not be viable. 

For additional information or assistance, please contact the laboratory at 503-693-4100

Method Details

Methodology

For isolates submitted: Agglutination by serotype-specific antisera
For approved primary specimens submitted: Specimens are forwarded to the CDC for slide agglutination serogrouping and molecular serotyping.

Performance Specifications

N/A

Change Log

1/30/2025
Reviewed, no changes
5/2/2023
Clarified How to Order, Time to Reporting, and Collection; Edited Methodology and Comments