Pick a set of numbers like 3.5-5 for K and stick with it. The clinical significance of 5.0-5.2 is not significant so dont stress over it. As a previous lab tech (I still dont know all the values) I recommend for simplicity just memorize the middle number as a baseline for what is normal. For ex your brain should think K=4; mg=2; CA=9; bam one number for each b/c these are the ideal perfect numbers for these elements. Also quick trick on rbc's, hgb, hct think rule of 3's rbc=4 and 4 x 3 is 12 the standard hgb. Then take 12 x3 and this gives you the standard hct 36. Another quick trick a lot of the therapeutic ranges on antibiotics is like around 1 so is dig. Well hope this helps Kat:banghead: