Which parameters are typically evaluated in urine specimen validity testing?

Which parameters are typically evaluated in urine specimen validity testing?

• A. Creatinine concentration, specific gravity, pH, oxidants, and temperature.
• B. Creatinine concentration and glucose only.
• C. Temperature and pH only.
• D. Specific gravity and color.

Answer: (A)

Urine specimen validity testing uses multiple indicators to determine if a sample is genuine and unaltered. Creatinine concentration helps gauge whether the sample is properly concentrated or diluted; very low creatinine can indicate dilution or substitution, while normal or expected levels support a valid specimen. Specific gravity also reflects urine density and concentration, helping to catch dilution or abnormal concentration that might suggest tampering. pH shows how acidic or basic the urine is; extreme values can point to adulterants or non-urine sources. The presence of oxidants signals the addition of oxidizing adulterants intended to mask drugs. Temperature checks ensure the sample was collected recently and isn’t substituted with something at room temperature or outside the normal body temperature range. Together, these parameters provide a robust check on specimen integrity, which is why this combination is preferred. Other options miss one or more critical aspects—either omitting concentration and adulterant detection, or lacking essential temperature and pH checks—so they don’t offer the same level of validity assessment.

Urine specimen validity testing uses multiple indicators to determine if a sample is genuine and unaltered. Creatinine concentration helps gauge whether the sample is properly concentrated or diluted; very low creatinine can indicate dilution or substitution, while normal or expected levels support a valid specimen. Specific gravity also reflects urine density and concentration, helping to catch dilution or abnormal concentration that might suggest tampering. pH shows how acidic or basic the urine is; extreme values can point to adulterants or non-urine sources. The presence of oxidants signals the addition of oxidizing adulterants intended to mask drugs. Temperature checks ensure the sample was collected recently and isn’t substituted with something at room temperature or outside the normal body temperature range. Together, these parameters provide a robust check on specimen integrity, which is why this combination is preferred. Other options miss one or more critical aspects—either omitting concentration and adulterant detection, or lacking essential temperature and pH checks—so they don’t offer the same level of validity assessment.