Check the NCLEX test bulletin to see if it lists any lab values in it. The NCLEX is a standardized test that is designed to be given throughout the country. The test question writers are very much aware that there are slight differences in what some labs around the country determine are normal parameters, so they keep the questions fair so all can answer them. Therefore, don't get hung up on these slight nuances in lab values. If you get a question on the NCLEX with a lab value that is out of whack, it is going to be noticeably out of whack, not just slightly a shift to the left or right. On the NCLEX, if you are given a potassium level of 5.7 mEq or a calcium level of 12 mg, everyone should recognize that these are high, no question about it.