| 
   % Diff, (Mean(Stored)-Mean(Fresh))/Mean(Fresh)×100
  | Peak Area Ratio (n=3) |  
  | Validation samples | Cycle-1 | Cycle-2 | Cycle-4 |  
  | Fresh | Stored | %Diff | Fresh | Stored | %Diff | Fresh | Stored | %Diff |  
  | 2 pmol/106 cells | Mean | 0.04468 | 0.04322 | −3.3 | 0.04374 | 0.04277 | −2.2 | 0.04126 | 0.03820 | −7.4 |  
  | SD | 0.00164 | 0.00292 |  | 0.00193 | 0.00212 |  | 0.00362 | 0.00264 |  |  
  | CV% | 3.7 | 6.8 |  | 4.4 | 4.9 |  | 8.8 | 6.9 |  |  
  | 200 pmol/106 cells | Mean | 4.18137 | 3.84085 | −8.1 | 4.22040 | 3.94916 | −6.4 | 3.99101 | 3.85821 | −3.3 |  
  | SD | 0.29920 | 0.35352 |  | 0.04920 | 0.11375 |  | 0.13888 | 0.19987 |  |  
  | CV% | 7.2 | 9.2 |  | 1.2 | 2.9 |  | 3.5 | 5.2 |  |  |