Information on Uncertainty of Measurement in Quantitative Testing
 Department of Chemical Pathology, Prince of Wales Hospital, Shatin, New Territories, Hong Kong.

Assess the minimal percentage change for test result:

To assess if two results on a patient are significantly different from a biological variation, the two results being compared need to be present.

Minimal percentage change > 2.77 (CV_A² + CV_I²)^1/2 with 95% confidence

(adopted from Soletormos, et al. Clin Chem 1993; 10: 2077-83)

 - Analytical Performance Database for Clinicians

Remark:
Uncertainty of measurement is not applicable for qualitative tests such as faecal occult blood screening.