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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Troponin I

Test Code(s): TROP / GM2447

CPT Code(s): 84484

Methodology: Chemiluminescent Immunoassay

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: 1 hour.
Routine: 4 hours.

Specimen Requirements

Specimen: Blood

Collection Container: Preferred: Green cap with yellow ring (PST)
Also Acceptable: Green top, Red cap with yellow ring (SST), Red top

Collection Volume: Preferred: 1 mL
Pediatrics: 0.5 mL

Sample Analyzed: Plasma or serum

Volume Required: Preferred: 0.5 mL
Pediatrics: 0.2 mL

Specimen Processing: Centrifuge.  Transfer cell-free plasma/serum to plastic vial.  Refrigerate.

Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location.

Stability: Ambient: 7 days
Refrigerated: 2 weeks
Frozen: 8 weeks at -20 C


Reference Interval:

0 Days and up:  0.00 – 0.05 ng/mL


Interpretive Guidelines:


0.00-0.05 ng/mL:  Negative-repeat testing in two hours if clinically indicated.


0.06-0.49 ng/mL:  Suspicious for myocardial injury. Serial measurements may be necessary to confirm or exclude the diagnosis of acute coronary syndrome. Repeat testing in two hours if indicated.


0.50 ng/mL or greater:  Consistent with myocardial injury.  Clinical and laboratory correlation recommended.


Critical Calls: View

Troponin I

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