While your UCAT ID is static, your score requirements will shift based on the "deciles" (the performance of all test-takers that year).
Your UCAT number is generated as soon as you create an account on the official UCAT website.
However, the significance of the UCAT number lies not in its arithmetic, but in its application as a gatekeeper. Most universities use this score as a primary filtering mechanism. In a system where the majority of applicants hold top GCSE grades and predicted A-levels of A or A*, academic differentiation is nearly impossible. The UCAT number serves as a decisive tie-breaker. Universities employ various methodologies to utilize this data. Some institutions, such as Newcastle University, historically employ a strict threshold—a specific number above which an applicant is interviewed and below which they are rejected. Others, like the University of Sheffield or the University of Edinburgh, rank applicants solely by their UCAT score, offering interviews to the top percentile. In these contexts, the number is absolute; a difference of ten points can determine whether a student receives an offer or a rejection.
Yet, the UCAT number is not monolithic. Its value is entirely relative to the year group. A score of 2800 might be considered competitive in a year where the average is lower, but deemed insufficient in a year where the average rises. For instance, the average total score typically hovers around 2500, but "good" scores are generally considered to be 2800 or above, placing the applicant in the top quartile. This relativity forces applicants to be strategic. They must interpret their number not in isolation, but as a percentile rank against their peers. A high UCAT score can compensate for lower academic grades at some universities, while a lower score may force an applicant to pivot their strategy toward institutions that place less emphasis on the test or use a "holistic" review process.