Tool

0/1/2H Troponin Sampling Planner Tool

Clinical calculation support · Verify results before clinical use

Clinical planning tool

0/1/2-Hour Troponin Sampling Planner

Plan the clock times for serial high-sensitivity cardiac troponin (hs-cTn) sampling. Select the time of the initial sample to generate a schedule for the 0-hour, 1-hour, and 2-hour time points.

Initial sample

Enter the actual collection time of the baseline sample.

About this planner

This tool calculates clock times from the initial sample collection time. It does not calculate troponin deltas, classify patients into rule-out or abnormal groups, diagnose myocardial infarction, or recommend disposition.

Clinical use

Use hs-cTn with a validated clinical decision pathway and the specific assay's thresholds and change criteria.
Obtain and interpret an ECG promptly and integrate biomarker results with the clinical presentation.
Repeat sampling after a non-diagnostic initial result is generally recommended at 1–2 hours for hs-cTn; conventional cTn assays generally require 3–6 hours.
Timing matters: collect samples within the windows specified by the chosen pathway. If a sample is delayed, document the actual collection time and interpret results accordingly.

What the schedule does not mean

A planned time point is not itself a diagnostic threshold. The 1-hour and 2-hour pathways use assay-specific baseline concentrations and absolute changes; a third sample or later testing may be needed when the initial pathway does not establish a safe disposition.

References

Rao SV, O'Donoghue ML, Ruel M, et al. 2025 ACC/AHA/ACEP/NAEMSP/SCAI Guideline for the Management of Patients With Acute Coronary Syndromes. Journal of the American College of Cardiology. 2025. doi:10.1016/j.jacc.2024.11.009

Kontos MC, de Lemos JA, Deitelzweig SB, et al. 2022 ACC Expert Consensus Decision Pathway on the Evaluation and Disposition of Acute Chest Pain in the Emergency Department. Journal of the American College of Cardiology. 2022;80(20):1925–1960. doi:10.1016/j.jacc.2022.08.750

Clinical disclaimer: This planner supports timing only and is not a substitute for clinical judgment, ECG interpretation, a validated assay-specific clinical decision pathway, or local protocols. A single normal or low troponin value does not exclude acute myocardial infarction in every patient. Follow local emergency-care procedures for ongoing symptoms, ischemic ECG findings, hemodynamic instability, or other high-risk features.