Skip to main content
. 2015 Nov 1;1(3):FSO26. doi: 10.4155/fso.15.24

Figure 3. . Passing–Bablok regression analysis between lithium-heparinate tubes containing gel separator and those without for (A) hydroxychloroquine, (B) desethylchloroquine and (C) desethylhydroxychloroquine assay.

Figure 3. 

A total of 37 whole blood samples were collected from systemic lupus erythematosus patients treated with hydroxychloroquine. The solid and dashed lines indicate the regression line and CI for the regression line, respectively. Whatever the analyte, no significant deviation from linearity was observed (p > 0.1).

The formula of regression equations are the following:

Tubes with gel separator = 0.96 (95% CI: 0.93–1.02) × tubes without gel separator + 11.7 (95% CI: -12.5–15.8) for hydroxychloroquine.

Tubes with gel separator = 0.95 (95% CI: 0.90–1.02) × tubes without gel separator + 1.39 (95% CI: -2.76–5.19) for desethylchloroquine.

Tubes with gel separator = 0.95 (95% CI: 0.90–1.00) × Tubes without gel separator + 14.0 (95% CI: 2.0–34.9) for desethylhydroxychloroquine.