<prompt> The American Diabetes Association ADA recently lowered the cut off value for fasting glucose used in diagnosing diabetes mellitus from 140 mgdL to 126 mgdL. This reference interval change would be expected to produce which of the following alterations?Decrease the tests sensitivityIncrease the tests false negative rateIncrease the tests negative predictive valueIncrease the tests positive predictive value  <response>: The negative predictive value of a test PV- refers to the percent chance that a normal test result is a true negative TN; a healthy person with a normal test result rather than a false negative FN; a diseased person with a normal test result. It is expressed by the following formula: PV- TNTN FN Similarly, the positive predictive value of a test PV reflects the probability that an abnormal test result represents a true positive TP rather than a FP a TP is an abnormal test result in an individual with disease, while a FP is an abnormal test result in a healthy person. PV is calculated using the following formula :PV TPTP FP 