Referenssiväli

Referenssiväli, or reference interval, is a range of values that are used as a guide for interpreting medical test results. It is established by measuring a particular substance in a large group of healthy individuals and then calculating the range that encompasses the majority of these results. Typically, the reference interval represents the values found in 95% of the healthy population, meaning that 2.5% of healthy individuals may fall below the lower limit and 2.5% may fall above the upper limit.

The purpose of a reference interval is to help healthcare professionals determine whether a patient's test result is within the expected normal range. If a patient's result falls outside this interval, it may indicate a potential health issue that requires further investigation. However, it is important to note that a result outside the reference interval does not automatically mean a person is ill. Factors such as age, sex, pregnancy, and even the time of day can influence test results.

Reference intervals are specific to the laboratory performing the test, the methodology used, and the population studied. Therefore, a reference interval from one laboratory may differ slightly from that of another. Healthcare providers always consider the reference interval provided by the laboratory alongside other clinical information, such as a patient's medical history, symptoms, and physical examination, to make a diagnosis and treatment plan.