I also found that some labs have the decimal point with another number at the end (ex: 2.3); I found that while taking practice exams, when a lab value was asked or in the stem of the question, it didn't have the .5 or .6, etc behind the number and it was just a single number lab value. My suggestion would be to not worry about memorizing those extra decimal point numbers and if there is any of the "4.6-6.2" lab values to remember, just remember it as 4-6, etc.
Also, group similar lab numbers together. For me personally, names are easier than numbers. So ex: Dig level and lithium levels are very similar, a long with Cr level (dig is about .05-2, lithium is .06-1.3, Cr 0.5-1.3). I grouped similar lab values together but remembered them by the actual names to help me remember.
Some lab values have "men's normal is this number and women's normal is this number". In these situation, I remember the lowest of the two and the highest of the two, to help me remember one set of number for both the men and women. Ex: Cr normal for men is: 0.6-1.3 and Cr normal for women is: 0.5-1.0. I then put those numbers together to remember Cr normal as: 0.5-1.3 would be the normal. Hardly do they ever ask normal for men or normal for woman. I just took NCLEX today so I would know they didn't ask any of that.
My lab values here might be different from yours (I used Hurst for these) but what ever number you are using, I hope my strategies help.
Quote from scm0890
I am having difficulty remembering all the normal lab values. Does anyone know of any helpful tricks they used to remember them? All input is much appreciated