A few years ago, a doctor had doubts about the accuracy of the blood test report furnished by a neighbourhood pathology laboratory. He devised a test: he sent a sample containing red ink, marked as a patient’s blood sample. The report shocked him. It stated that the patient was hypothyroid as his thyroid stimulating hormone (TSH) level was above normal! Not only did the lab fail to detect that it was not a blood sample at all, it incorrectly diagnosed the condition of above-normal TSH as hypothyroidism when, actually, the diagnosis should have been hyperthyroidism.