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Lab Dept:
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Chemistry
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Test Name:
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TROPONIN I LEVEL
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General Information
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Lab Order Codes:
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TROP
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Synonyms:
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TnI
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CPT Codes:
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84484 – Troponin, quantitative
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Test Includes:
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Troponin I level reported in ng/mL.
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Logistics
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Test Indications:
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Troponin is detectable 4 - 6 hours after AMI (Acute Myocardial Infarction) with peak levels occurring at approximately 12 hours, and return to normal in 3-10 days. Troponin offers the following advantages over CK-MB:
Increased cardiac specificity; avoids clinical interference from skeletal muscle damage and renal insufficiency.
Provides a tool for late presenting patients and for perioperative and postoperative patients at risk for AMI; is comparable in cost.
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Lab Testing Sections:
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Chemistry - Sendouts
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Referred to:
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Abbott-Northwestern Hospital Laboratory/United Hospital
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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24 hours; 3 hours Stat
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Blood
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Container:
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Green top (Lithiun heparin) tube
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Draw Volume:
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1.5 mL (Minimum: 1.2 mL) blood
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Processed Volume:
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0.5 mL (Minimum: 0.4 mL) plasma
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Collection:
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Routine venipuncture
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Special Processing:
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Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into a screw-capped round bottom plastic vial. Store and ship at refrigerated temperatures. If specimen is to be stored more than 6 hours after collection, it should be frozen. Forward promptly.
Minneapolis lab call Allina Customer Service to request a pick-up 612-863-4678 (press#1). St. Paul Lab should tube samples to United Laboratory.
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Patient Preparation:
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None
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Sample Rejection:
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Hemolysis; mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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<0.035
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Normal, healthy individuals
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Note: TnI values above the normal cut-off are usually 5-10 fold higher than Troponin T. There is low renal interference. A significantly elevated TnI cannot be “written off” as renal interference.
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Critical Values:
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N/A
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Limitations:
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N/A
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Methodology:
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ELCA Electrophoresis
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References:
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Allina Hospital Laboratories March 2012
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Updates:
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6/21/2011: Update turnaround time information.
3/5/2012: Test changed from Troponin T to Troponin I. Troponin T is no longer available.
3/15/2012: Tube type changed from red top to green top.
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