QC Low [2 µg/ml] Time Mean Accuracy% Stability% 0 hour   1.99 98.72   98.50 97.25 97.74 30 days  1.96 100.50 98.91 98.50 QC High [12.8 µg/ml] Time Mean Accuracy% Stability% 0 hour   97.89   99.68 97.51 97.35 30 days   96.95 97.27 97.81

Table 4: Long term stability data of pioglitazone in serum.