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

Monday through Sunday

Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.

3 days

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Clinic Laboratories until the release of the test result

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