Not sure what you mean by "how to predict" some of those numbers
You need to know what the normal limits are. At first you'll have to look it up, but after a while you will come to know that a K of, say 5.5 is high. If the normal limits don't show up on the lab reports, get a Maxwell guide...most are listed in there (and it has most of the formulas you forget all the time, like FeNa). When you jot down you pt's labs, look up the normal values and then circle the ones that are NOT normal. That will help them stand out in your mind.
So you will find that you get used to seeing low Hct. Low Ca is also very common, but don't forget you must correct it for albumin, which is also very commonly low.
Recall that creatinine is a surrogate for GFR. Calcualte the BUN/Cr to assess if the cause of any elevation of those is prerenal.
Remember that the LFT are poorly named. The so called LFT are markers of liver cell damage. Liver function (ie if it's making all the right stuff) is better monitored by the PT and PTT, and albumin.
perhaps rather than dragging around another pocket reference, you should start by a basic review of the common lab tests in your reading you do at home. That way you'd have time to think about it and then apply it to your pt's labs without time pressure.
