It is a basis for a physician or other health professional to interpret a set of results for a particular patient.
Reference range or reference interval usually describes the variations of a measurement or value in healthy individuals. However, there are also optimal health ranges that are those that appear to have the optimal health impact on people. Reference ranges are usually given as what are the usual (or normal) values found in the population, more specifically the prediction interval that 95% of the population fall into. This may also be called standard range. However, usual and optimal levels may differ substantially, most notably among vitamins and blood lipids, so these tables give limits on both standard and optimal (or target) ranges.In contrast, optimal (health) range or therapeutic target is a reference range or limit that is based on concentrations or levels that are associated with optimal health or minimal risk of related complications and diseases. For most substances presented, the optimal levels are the ones normally found in the population as well. The standard definition of a reference range (usually referred to if not otherwise specified) basically originates in what is most prevalent in a reference group taken from the population. More specifically, optimal levels are generally close to a central tendency of the values found in the population.
He can decide to note your weight in pounds or in kilograms. In this same way, labs may choose to use different units of measurement for your test results. The units of measurement that labs use to report your results can vary from lab to lab. Click on the button and 'Reference Ranges' interface will popup. Open your test by clicking 'Edit Test' button. On the right hand of the parameter you can find a small button. Test's reference ranges may differ from lab to lab due to equipment and methodology differences. Regardless of the units that the lab uses, your results will be interpreted in relation to the reference ranges supplied by the laboratory. By using the interface you will be able to update name of measurement units and the parameter's reference range. Also reference intervals may vary from area to area. In Medical Tests Analyzer interface you can adjust measurement units naming and reference interval (range) as well. Select a parameter on your test you want to update, for example 'Rheumatoid factor'. It is similar to the way, for instance, your physician chooses to record your weight during an examination. Frequently, what is considered a normal result range in your area is not totally the same somewhere else.