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. Author manuscript; available in PMC: 2009 Sep 16.
Published in final edited form as: J Anal Toxicol. 2007 Jun;31(5):265–269. doi: 10.1093/jat/31.5.265

Table V.

Stability of Methadone and Metabolites at a Concentration of 400 ng/mL (% found) at Certain Parameters

24°C, 24 h 4°C, 24 h Three Freeze-
Thaw Cycles
Methadone 100.2 101.4 109.2
EDDP 85.9 95.9 98.3
EMDP 108.9 103.0 99.7