. 2019 Sep 19;17:e00136. doi: 10.1016/j.plabm.2019.e00136

Table 2.

Measured serotonin concentrations in platelet-poor plasma from healthy donors (N = 9).

Pre-analytical method	Measured Serotonin Concentration (ng/mL)¹
A	0.9 ± 0.5^a
B	2.5 ± 2.3^a
C	1.0 ± 0.5^a
D	9.8 ± 11.1^b
E	41.4 ± 18.6
F	10.7 ± 1.6^b

Serotonin concentration is presented as mean ± standard deviation. Serotonin concentrations in PPP prepared by method E was discarded from statistical analysis since results deviated strongly from results obtained with the other pre-analytical methods.

¹Methods A, B, C, D and F are compared using one-way ANOVA (p = 1.4 × 10⁻⁴) with Tukey post-hoc test; means in a column with different letters are significantly different (p < 0.05).