Table 4.

Sensitivity and specificity for test AKIN Stage III

FST Index	Sensitivity	Specificity
Urine output in hour 2 (individual)
< 50 ml	52.2%	94.2%
< 100 ml	65.2%	87.0%
< 150 ml	87.0%	81.2%
< 200 ml	87.0%	73.9%
< 250 ml	95.7%	69.6%
Total urine output over 2 hours (cumulative)
< 100 ml	43.5%	94.2%
< 200 ml	73.9%	90.0%
< 300 ml	78.3%	84.1%
< 400 ml	87.0%	65.2%
< 500 ml	87.0%	55.1%

Table 4. Specific urine output cut-offs for progression to AKIN stage III AKI were assessed. The 2-hour urine output of 200 mls offered the best combination of sensitivity and specificity.