Calculation of reference intervals using an indirect approach from laboratory database

Area of Science:

• Clinical Biochemistry
• Laboratory Medicine
• Diagnostic Accuracy

Background:

• Accurate interpretation of laboratory test results relies on established reference intervals (RIs).
• Traditional RI determination requires recruiting healthy individuals, which can be resource-intensive.
• An indirect approach using routine clinical samples offers a potential alternative for RI establishment.

Purpose of the Study:

• To evaluate the feasibility of determining reference intervals (RIs) using an indirect approach.
• To leverage large datasets from routine clinical samples for RI calculation.
• To ensure the quality and adequacy of sample sizes while excluding pathological values.

Main Methods:

• A prospective study analyzing routine primary care samples.
• Inclusion of biochemical markers such as creatinine, esterified bilirubin, ferritin, and transferrin.
• Implementation of a patient exclusion protocol to identify and remove pathological results.
• Comparison of newly calculated RIs with manufacturer-provided laboratory RIs.

Main Results:

• The indirect approach yielded robust reference intervals (RIs).
• No statistically significant differences were observed between newly calculated RIs and existing laboratory RIs.
• Data quality and sufficient sample size were maintained throughout the study.

Conclusions:

• The indirect approach is an effective method for determining reference intervals (RIs).
• Rigorous data quality standards and adequate sample sizes are essential for success.
• Adoption of these RIs can improve diagnostic accuracy and optimize healthcare resource utilization.