Test Catalog

Test Id : CAURB

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Candida auris, Molecular Detection, PCR, Blood

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Overview

Test Catalog

Useful For
Suggests clinical disorders or settings where the test may be helpful

Detecting Candida auris in whole blood specimens

 

This test should not be used to determine cure or to monitor response to therapy.

Method Name
A short description of the method used to perform the test

Real-Time Polymerase Chain Reaction (PCR)

NY State Available
Indicates the status of NY State approval and if the test is orderable for NY State clients.

Yes

Reporting Name
Lists a shorter or abbreviated version of the Published Name for a test

Candida auris PCR, B

Aliases
Lists additional common names for a test, as an aid in searching

C. auris

Specimen Type
Describes the specimen type validated for testing

Whole Blood EDTA

Ordering Guidance

This test should not be ordered for surveillance purposes. Order CAURS / Candida auris Surveillance, Molecular Detection, PCR, Varies and collect an axilla/groin swab for surveillance.

Additional Testing Requirements

This test should always be performed in conjunction with FBL / Fungal Culture, Blood, which has different collection requirements; see FBL for specifics.

Shipping Instructions

Specimen must arrive within 7 days of collection.

Necessary Information

Specimen source is required.

Specimen Required
Defines the optimal specimen required to perform the test and the preferred volume to complete testing

Container/Tube: Lavender top (EDTA)

Specimen Volume: 3 mL

Collection Instructions: Send whole blood specimen in original tube. Do not aliquot

Forms

Specimen Minimum Volume
Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory

0.3 mL

Reject Due To
Identifies specimen types and conditions that may cause the specimen to be rejected

  All specimens will be evaluated at Mayo Clinic Laboratories for test suitability

Specimen Stability Information
Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen Type Temperature Time Special Container
Whole Blood EDTA Refrigerated (preferred) 7 days
Frozen 7 days

Useful For
Suggests clinical disorders or settings where the test may be helpful

Detecting Candida auris in whole blood specimens

 

This test should not be used to determine cure or to monitor response to therapy.

Clinical Information
Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

Candida auris can cause serious, and sometimes fatal, infections, is often resistant to one or more classes of antifungal drugs, and inappropriate treatment may occur as it can be misidentified in the laboratory. In addition, Candida auris appears to be more resistant to disinfection than other yeasts, leading to prolonged survival in the environment, increasing the possibility of transmission in hospitals and nursing homes.

 

The C auris polymerase chain reaction assay can be used to detect C auris from blood.

Reference Values
Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

Not applicable

Interpretation
Provides information to assist in interpretation of the test results

A positive result indicates the presence of Candida auris DNA.

 

A negative result indicates the absence of detectable C auris DNA.

 

An inhibited result indicates that inhibitors are present in the specimen that could prevent the detection of C auris DNA. A new specimen can be resubmitted under a new order, if desired.

Cautions
Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

A negative result does not rule out the presence of Candida auris because the organism may be present at levels below the limit of detection for this assay.

 

This assay detects C auris nucleic acid and, therefore, does not distinguish between viable, disease-related organisms and nucleic acid persisting from prior or treated infection. Test results should be correlated with patient symptoms and clinical presentation before a definitive diagnosis is made.

Supportive Data

During test verification, 32 culture isolates of Candida auris, previously identified using the Bruker matrix-assisted laser desorption/ionization time-of-flight mass spectrometer, were tested, and all 32 positively identified as C auris by this polymerase chain reaction (PCR) assay.

 

Verification studies indicated that the limit of detection (LOD) for C auris spiked into blood was 54 colony-forming units (CFU)/20 mcL reaction. To evaluate the accuracy of the assay, 30 blood specimens were spiked with C auris at 1 log above the LOD and 29/30 were positive (97%) by the PCR assay.

 

A specificity panel consisting of 78 common skin flora organisms or pathogens (bacteria, yeast, molds, viruses, and parasites) and all were negative by the PCR assay. No positivity was found with any other species of Candida including the closely related Candida duobushaemulonii and Candida haemulonii.

Clinical Reference
Recommendations for in-depth reading of a clinical nature

1. Spivak ES, Hanson KE: Candida auris: an emerging fungal pathogen. J Clin Microbiol. 2018 Jan;56(2):e01588-17

2. Centers for Disease Control and Prevention (CDC) National Center for Emerging and Zoonotic Infectious Diseases (NCEZID), Division of Foodborne, Waterborne, and Environmental Diseases (DFWED): Candida auris. CDC; Updated December 27, 2022. Accessed March 8, 2023. Available at: www.cdc.gov/fungal/candida-auris/index.html

3. Navalkele BD, Revankar S, Chandrasekar P: Candida auris: a worrisome, globally emerging pathogen. Expert Rev Anti Infect Ther. 2017 Sep;15(9):819-827

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

Genomic DNA is extracted. The extracted DNA is placed on the LightCycler 480 instrument, which amplifies and monitors by fluorescence, the development of target nucleotide sequences after each polymerase chain reaction (PCR) cycle. A specific 269 base pairs target sequence from a portion of the 28S rDNA gene from Candida auris is amplified and the resulting segment is detected by melt-curve analysis using sequence-specific fluorescence resonance energy transfer hybridization probes. An internal control is added to every sample to monitor for extraction and PCR inhibition in the specimen.(Walchak RC, Buckwalter SP, Zinsmaster NM, et al: Candida auris direct detection from surveillance swabs, blood, and urine using a laboratory-developed PCR method. J Fungi (Basel). 2020 Oct 15;6(4):224. doi: 10.3390/jof6040224)

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

No

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.

1 to 3 days

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

7 days

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

Rochester

Fees
Several factors determine the fee charged to perform a test. Contact your U.S. or International Regional Manager for information about establishing a fee schedule or to learn more about resources to optimize test selection.

  • Authorized users can sign in to Test Prices for detailed fee information.
  • Clients without access to Test Prices can contact Customer Service 24 hours a day, seven days a week.
  • Prospective clients should contact their Regional Manager. For assistance, contact Customer Service.

Test Classification
Provides information regarding the medical device classification for laboratory test kits and reagents. Tests may be classified as cleared or approved by the US Food and Drug Administration (FDA) and used per manufacturer instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR) product.

This test was developed, and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information
Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Clinic Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.

CPT codes are provided by the performing laboratory.

87481

LOINC® Information
Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the order and results codes of this test. LOINC values are provided by the performing laboratory.

Test Id Test Order Name Order LOINC Value
CAURB Candida auris PCR, B 95766-2
Result Id Test Result Name Result LOINC Value
Applies only to results expressed in units of measure originally reported by the performing laboratory. These values do not apply to results that are converted to other units of measure.
SRCAB Specimen Source 31208-2
607882 C auris PCR, Result, B 95766-2

Test Setup Resources

Setup Files
Test setup information contains test file definition details to support order and result interfacing between Mayo Clinic Laboratories and your Laboratory Information System.

Excel | Pdf

Sample Reports
Normal and Abnormal sample reports are provided as references for report appearance.

Normal Reports | Abnormal Reports

SI Sample Reports
International System (SI) of Unit reports are provided for a limited number of tests. These reports are intended for international account use and are only available through MayoLINK accounts that have been defined to receive them.

SI Normal Reports | SI Abnormal Reports