Table 2. Stability of serum eosinophil-derived neurotoxin.

Samples from 7 healthy volunteers were tested every day for short term stability and freeze/thaw, and every three months for long term stability. During the testing period the mean sample values should not exceed ± 15% the baseline value taken when the serum was prepared.

Stability Test	Testing period	Mean change from baseline at end of testing period
Short term at 2–8°C	7 day	-5.5%
Long term at -20°C	12 months	-7.6%
Long term at -80°C	12 months	-4.9%
Freeze/thaw at -20°C	3 cycles	-3.3%
Freeze/thaw at -80°C	3 cycles	-4.7%