The Siemens POC High Sensitivity Troponin-I Test System is an in vitro diagnostic test for the quantitative measurement of cardiac troponin I (cTn-I) in fresh human capillary (fingerstick) whole blood, and lithium-heparinized venous whole blood or plasma, to be used by healthcare professionals at the point of care (POC) as well as in the clinical laboratory.

The Siemens POC High Sensitivity Troponin-I Test System is to be used as an aid in the diagnosis of myocardial infarction (MI).

Study purpose/objective:

• Evaluate the clinical performance of the Siemens POC HS cTn-I test system for the diagnosis and rule out of AMI in patients presenting to the emergency department in whom serial cTnI measurements are obtained on clinical indication.
• Correlate the blood and plasma outcomes on the Siemens POC HS cTn-I test system as function of the corresponding hematocrit (Hct) values.

Hypothesis: The Siemens POC HS cTn-I Test System will offer an excellent diagnostic performance for acute myocardial injury and acute myocardial infarction, as well as expedite the risk stratification of patients for early discharge from the emergency department.

Inclusion Criteria:

1. Presents to the ED, or ambulatory care center equivalent, with signs or symptoms suspicious of a possible ACS event.
2. Baseline cTn-I measurement and one additional cTn-I measurement at two hours after the first measurement.
3. At least one 12-lead electrocardiogram

Exclusion Criteria

1. Less than 21 years old
2. Pregnancy
3. Trauma
4. Declines to participate or has indicated that their blood/ medical information cannot be used for investigational purposes
5. Did not present through the ED
6. Transferred from an outside hospital or clinic.

Consecutive patients (goal, 1000 patients over 4 months) presenting to the emergency department, in whom serial cTnI measurements are ordered on clinical indication at Hennepin Healthcare / Hennepin County Medical Center (Minneapolis, MN, USA) to rule-in and rule-out acute myocardial infarction.