Published: 19 May 2024

False Positive and False Negative Results

* False Positive Result: A test result that indicates the presence of a disease or condition that you do not actually have.
* False Negative Result: A test result that indicates the absence of a disease or condition that you do actually have.

While these incorrect results are rare, they can occur more frequently with certain tests or improper testing procedures. Even though false positives and negatives are uncommon, your healthcare provider may perform multiple tests to ensure an accurate diagnosis.

Factors Affecting Test Results

Various factors can influence the accuracy of test results, including:

* Foods and beverages
* Medications
* Stress
* Vigorous activity
* Laboratory procedures
* Concurrent illnesses

Consult your healthcare provider with any questions or concerns regarding your lab tests and results.

Reference Ranges

* Reference populations are selected based on factors such as age, gender, ethnicity, health status, and medical history, depending on the test and its potential influencing factors.
* A substantial number of individuals (typically over 120) from the reference population undergo testing under standardized conditions.
* Results are statistically analyzed, and reference ranges typically encompass the values observed in the middle 95% of the reference population.
* Labs establish reference ranges through their own studies, adopting ranges from manufacturers or other labs, or utilizing existing patient data.
* Defining the reference population is crucial for determining accurate reference ranges.