. Author manuscript; available in PMC: 2010 Jul 1.

Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2009 May 21;877(20-21):1907–1914. doi: 10.1016/j.jchromb.2009.05.029

Table 4.

Long Term Stability of TFV and FTC in Plasma

Long Term Plasma Stability of TFV and FTC at −80°C Proficiency Testing Samples ACTG PT Rd 15 (March 2005)
1/9/2008	Nominal		1/9/2008	Nominal
TFV	Rd 15	%DIFF	FTC	Rd 15	%DIFF
363	387	−6.2	94.8	90.0	5.3
732	773	−5.3	447	450	−0.7
74.8	77.0	−2.9	853	900	−5.2
288	299	−3.7	524	550	−4.7
2301	2308	−0.3	101	100	1.0

Elapsed Time: 34 months