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There is no health-based reference value for nickel in urine. The German HBM Commission examined exactly this question and concluded that HBM values for nickel in urine cannot be derived: nickel is carcinogenic and sensitising, and no health-safe threshold is definable for such substances. A background-exposure reference value does exist (3 µg/l in German adults), but the Commission states explicitly that it may not be used to answer a health question: being above it means more exposed than most people, not ill. The other published nickel limits apply to occupational exposure and do not apply to the general population. Discuss your result with your doctor.