Your
creatinine and eGFR are both normal, and together these are the best reflection of how well your kidneys are filtering right now. Urea at 42 sits a touch above many labs' usual range, but on its own, with everything else normal, it isn't something to be concerned about.
Next Steps
Urea can rise slightly with a high-protein meal, less water that day, or even recent exercise, so repeating it after a couple of well-hydrated days is a reasonable next step.
Health Tips
If urea stays raised on a repeat test, or you notice swelling, reduced urine or unusual tiredness, please consult a physician.