No professionally designed and validated IQ test claims to distinguish test-takers at the one-in-a-million level of rarity of score. The standard score range of the Stanford-Binet IQ test is 40 to 160. The standard scores on most other currently normed IQ tests fall in the same range. A score of 160 corresponds to a rarity of about 1 person in 30,000 (leaving aside the issue of error of measurement common to all IQ tests), which falls short of the Mega Society's 1 in a million requirement. IQ scores above this level are dubious as there are insufficient normative cases upon which to base a statistically justified rank-ordering. High IQ scores are less reliable than IQ scores nearer to the population median.