When you look at a lab report you will see numerical results and some of them will be marked as being high or low. If a lab result is marked as neither high nor low, then it is within a normal range. Something is marked "high" when the result is higher than the normal range; "low" when the result is lower than the normal range. Highs and lows need to be addressed by the doctor. Another term you will hear is "panic value". This is a high or low result that is way at the far end of the range of values and needs to be reported to the doctor immediately as some kind of intervention is needed right away. If you look very closely at any lab report you should see a normal range listed by each value being reported so you have the normal scale right at your fingertips to compare the actual result to.