See also: 85% of hospital admissions for chest pain are NOT heart attack. 1  3. Cough: persistent coughing or wheezing can be a symptom of heart failure. 2  4. Dizziness: heart attacks or heart rhythm abnormalities can cause light-headedness or even loss of consciousness.
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A: LabCorp performs initial drug screening using immunoassay. An immunoassay is a test that uses antibodies to detect the presence of drugs and other substances in urine. The initial screening process does not measure the specific amount of drug present in urine samples.It provides either a positive or negative result, indicating the presence or absence of detectable drug.n immunoassay is a test that uses antibodies to detect the presence of drugs and other substances in urine. The initial screening process does not measure the specific amount of drug present in urine samples.