quantitative insulin sensitivity check index quantitative insulin sensitivity check index the quantitative insulin sensitivity check index (quicki) is derived using the inverse of the sum of the logarithms of the fasting insulin and fasting glucose: 1 / (log(fasting insulin μu/ml) + log(fasting glucose mg/dl)) this index correlates well with glucose clamp studies (r = 0.78), and is useful for measuring insulin sensitivity (is), which is the inverse of insulin resistance (ir). it has the advantage of that it can be obtained from a fasting blood sample, and is the preferred method for certain types of clinical research. values typically associated with the quicki calculation for insulin resistance in humans fall broadly within a range between 0.45 for unusually healthy individuals and 0.30 in diabetics. so lower numbers reflect greater insulin resistance.