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Test Code LAB591 Troponin T high-sensitivity

Performing Laboratory

St. Louis Children's Hospital Laboratory - Chemistry

Specimen Requirements

Patient Preparation: None

Collection Container/Tube:

Preferred: Mint green-top Lithium Heparin (MNTGRN LiHep) tube

Acceptable: Green samplette/microtainer, plain red-top tube, or Gold SST gel tube

Submission Container/Tube: If specimen is coming from outside facility and collected in a microtainer or plain red-top tube aliquot processed sample into a plastic vial for transport (labeling with specimen type).

Specimen Collection Volume: 1.0 mL (minimum 0.6 mL)

Special Instructions: None

Sample Rejection

Mislabled or unlabeled specimens

Specimens that are grossly hemolyzed

Logistics

Test Availability: Monday-Sunday

Cut-off time: None, performed as received

Turnaround Time: Same Day; 2 hours from receipt in performing lab

Reference Values

Reference Interval: 

<1 month: 20-100 ng/L
1-6 months: <40 ng/L
6 months - 1 year: <20 ng/L
1-15 years: <14 ng/L
≥ 15 years:  
     male: <23 ng/L                                                                                
     female: <15 ng/L
note: UOM were updated in 2024 for new method of analysis

Critical Value: none established

 

Methodology

CTnT: Electrochemiluminescence Immunoassay (ECLIA)

Limitations

  • Specimens from patients who have received preparations of mouse monoclonal antibodies for diagnosis or therapy may contain human anti-mouse antibodies (HAMA). Such specimens may show either falsely elevated or depressed values when tested with assay kits that employ mouse antibodies.
  • Heterophilic antibodies in human serum can react with reagent immunoglobulins, interfering with in vitro immunoassays. The presence of heterophilic antibodies in a patient specimen may cause anomalous values to be observed.

Additional Information

FOR SLCH CORE LABORATORY USE ONLY

Lab Processing Instructions: Centrifuge to separate. If specimen is collected in microtainer or plain red-top tube aliquot sample into a Roche false-bottom tube for testing (labeling aliquot with specimen type).

Processed Volume: 0.3 mL plasma/serum

Analyte Stability:

Specimen Type Temperature Time
Whole Blood (unprocessed)  Ambient 8 hours
Plasma/Serum (processed)

Refrigerated (preferred)

specimen removed from gel or cells   

 72 hours
  Ambient  8 hours
  Frozen  30 days     

 

NOTE: if testing will be delayed >8 hours, remove the specimen from gel and store in refrigerator

Test Classification and CPT Code

84484

LOINC

in process

Last Reviewed

07/2025