ARUP's Laboratory Test Directory

Troponin I : 0090613

Mnemonic: TNI

Ordering Recommendation: Recommended test for the diagnosis and management of acute coronary syndrome.
Methodology: Chemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect: Plasma separator tube.

Specimen Preparation: Remove plasma from cells ASAP or within 2 hours of collection. Specimen must be free of particulate matter including fibrin which can interfere with the assay. Avoid transferring material from the white blood cell/platelet layer located just above the red blood cells. Transport 1 mL plasma. (Min: 0.5 mL)

Storage/Transport Temperature: Frozen.

Unacceptable Conditions: Serum. Specimens exposed to repeated freeze/thaw cycles.

Stability (collection to initiation of testing): Ambient: 8 hours; Refrigerated: 72 hours; Frozen: 1 month

Reference Interval:
Effective May 21, 2012
0.0-0.03 ng/mL
Interpretive Data: 0.03 ng/mL or less: Negative - repeat testing in four to six hours if clinically indicated.
0.04-0.29 ng/mL: Suspicious for myocardial injury. Serial measurements may be necessary to confirm or exclude the diagnosis of acute coronary syndrome.  Repeat testing in four to six hours if indicated.
0.30 ng/mL or greater: Consistent with myocardial injury. Clinical and laboratory correlation recommended.
CPT Code(s): 84484