HBsAg: hepatitis B surface antigen; HCV: hepatitis C virus; HDL: high-density lipoprotein; LDL: low-density lipoprotein; VLDL: very low-density lipoprotein; HbA1c: hemoglobin A1c; TSH: thyroid-stimulating hormone; FT3: free triiodothyronine; PSA: prostate-specific antigen; CEA: carcinoembryonic antigen; PTH: parathyroid hormone; CBNAAT: Cartridge-Based Nucleic Acid Amplification Test; ADA: adenosine deaminase; GI: gastrointestinal; TLC: total leucocyte count; DLC: differential leucocyte count; TB: tuberculosis; CMD: corticomedullary differentiation. The gene discussed is CEACAM5; the disease is tuberculosis.