Body fluid: Only fresh, non-NALC/NaOH-digested body fluid is acceptable.
Gastric washing: Neutralize specimen within 4 hours of collection with 100 mg of sodium carbonate per 5 to 10 mL of gastric washing.
Stool: Only fresh, non-NALC/NaOH-digested stool is acceptable.
Tissue: Only fresh - keep moist with sterile water or saline, non-NALC/NaOH-digested tissue is acceptable.
Urine: Collect a random urine specimen.