Hi Jeannette!
Lets see, according to my Lab the TSI quantitative was 3.3. Their ratings go: <2.0- not detected, 2.0-3.0 Indeterminate, 3.0-5.0 weakly positive and greater than 5.0- Positive. The units are called SD or Standard Deviations above the mean of a reference group of normal subjects.
Bruce