Reference intervals used in medical laboratory diagnostics


Semmelweis University, Faculty of Medicine

The reference intervals are published only in PDF format.

Reference intervalsThe document can be downloaded:


You are supposed to know these values (together with the proper unit) for the semifinal and final exams.

Why are these values different from what you can find in other textbooks?

Different labs may use different methods, so some variation is expected. Reference values may depend on sex, age, race or other factors. So these values are useful approximations, it is not worth to learn them exactly.

Why call it a reference interval, instead of a normal value?

It is clear that an interval is necessary instead of a single value because of biological variability. Nowadays we prefer the term "reference interval" instead of the "normal interval" used previously. There are several reasons for this: on one hand we want to show, that you cannot expect to be able to determine if a person has a particular disease or not, by measuring a single laboratory parameter. On the other hand, we also avoid the use of the term "normal", which is very difficult to define.

Last change: 2017.09.03. 10:10