Days of storage (dried serum) | Serum GGT Levels (U/L) Mean (SD) (N = 12)* |
Day 0 Direct | 346.2 (436.16) |
Day 0 dried serum | 339.35 (440.53) |
Week 1 | 322.13 (409.08) |
Week 2 | 328.22 (402.12) |
Week 3 | 325.07 (406.48) |
Week 4 | 312.67 (393.19) |