Author/Publication (Reference) No. of Cases Reported L/P Ratio
Pare et al. 1987 (83) 1 3.7
Matejczyk 1998 (84) 1 2.4
Levine et al. 1990 (62) 1 1.2
Chaturvedi et al. 1990 (85) 1 4.3
Anderson & Muto 2000 (17) 10 5.5 ± 2.9*
Ropero-Miller 2004 (86) 1 5.0
Coopman et al. 2007 (87) 1 1.3
Luckenbill et al. 2008 (77) 9  9.5 ± 11.2*
Jumbelic 2010 (14) 8 5.0 ± 2.1*
Olson et al. 2010 (FB2) (70) 18 12.2 ± 15.7*
  Overall Mean 5.0
  Standard Deviation 3.5
L = Liver, P = Peripheral Blood
*Mean ± standard deviation
Table 6: Evaluation of Literature Fentanyl L/P Ratios.