The disclosure, according to one embodiment, relates to a breath analyzer device for detecting concentration of a marker, such as pentane, in air exhaled by a patient. The device may include a detector having a solid state sensor able to detect pentane in a concentration of between 1 nmol/l to 5 nmol/l in air exhaled by a patient. The solid state sensor may include a carbon nanotube. The breath analyzer may include a body having a breath detection channel in which the detector is located, a display, and a power source. The disclosure also relates to a method of detecting myocardial infarction in a patient by detecting pentane in exhaled air from the patient.