TROPONIN

Test Code

LAB139

Quest Code

34693

CPT Codes
84484

Preferred Specimen

Quest Lab: 1 mL frozen serum
*Stat to Mercy Lab: Green top w/ Gel (Li Heparin), spun down.

Minimum Volume

Quest Lab: 0.5 mL
*Stat to Mercy Lab: 2 mL

Other Acceptable Specimens

Plasma collected in: Lithium heparin (green-top) tube

Instructions

Centrifuge tube and separate plasma into a plastic specimen transport tube. Freeze as soon as possible (within 4 hours).

Transport Container

Transport tube

Transport Temperature

Frozen

Specimen Stability

Room temperature: 4 hours
Refrigerated: Unacceptable
Frozen: 40 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Received room temperature • Received refrigerated • EDTA plasma • Sodium heparin (green-top) tube

Methodology
Immunoassay (IA)

Setup Schedule

Mon-Sat

Report Available

3 days

Limitations

Non-acute coronary syndromes may cause troponin elevation.

Reference Range

≤47 ng/L

Clinical Significance

Troponin I is part of a protein complex which regulates the contraction of striated muscle. In acute coronary syndromes (ACS), it can be detected in blood at 4-8 hours following the onset of chest pain, reaches a peak concentration at 12-16 hours, and remains elevated for 5-9 days. Troponin I has been used as a reliable marker in the diagnosis of perioperative myocardial infarction in patients undergoing cardiac surgery.

Performing Laboratory

Quest Diagnostics-Lenexa

10101 Renner Blvd

Lenexa , KS 66219-9752

Last Updated: September 12, 2023

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.