Their limited sensitivity (~100 pg mL−1) of the test devices and its detection time of a couple of hours [12], however, would not allow the cTnI level ≤ 10 pg mL−1 in serum to be reliably measured 1–2 h after onset of the symptom such as a heart attack (whereupon its level reaches ~100 ng mL−1 3–4 h after the onset) [14]. This evidence concerns the gene TNNI3 and myocardial infarction.