Test Catalog

Test ID: CDIP    
Corynebacterium diphtheriae Culture, Varies

Method Description Describes how the test is performed and provides a method-specific reference

Culture is performed using sheep blood agar and the selective medium, cystine-tellurite blood agar, incubated at 35 degrees C in a CO2-enriched atmosphere. Colonies of Corynebacterium diphtheriae are gray-black on tellurite-containing agar, while usual oral flora is inhibited. Suspect colonies are identified by conventional methods to rule-out C diphtheriae. For Mayo Clinic patients or Mayo Clinic Laboratories clients from Minnesota, isolates identified as C diphtheriae are forwarded to the Minnesota Department of Health for toxin testing.(Synder JW: Corynebacterium diphtheriae Cultures. In: Leber, AL ed. Clinical Microbiology Procedures Handbook. 4th ed. American Society for Microbiology. 2016: section 3.11.7)

PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information


Day(s) Performed Outlines the days the test is performed. This field reflects the day that the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time before the test is performed. Some tests are listed as continuously performed, which means that assays are performed multiple times during the day.

Monday through Sunday

Report Available The interval of time (receipt of sample at Mayo Clinic Laboratories to results available) taking into account standard setup days and weekends. The first day is the time that it typically takes for a result to be available. The last day is the time it might take, accounting for any necessary repeated testing.

3 to 5 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

2 days

Performing Laboratory Location Indicates the location of the laboratory that performs the test