Table 3 Diagnostic properties comparing the collection type for VDRL and TPHA tests.
From: Accuracy of capillary blood sampling for diagnosing syphilis infection
Serological tests¹ | Capillary, N | Venous, N | Diagnostic properties, % (95% CI) | ||||
|---|---|---|---|---|---|---|---|
Sensitivity | Specificity | Positive predictive value | Negative predictive value | ||||
VDRL | |||||||
Overall | 191 | 191 | 99 (95.0-100.0) | 100 (94.0-100.0) | 100 (97.0-100.0) | 97 (88.0-100.0) | |
Adequate samples | 113 | 113 | 99 (94.0-100.0) | 100 (86.0-100.0) | 100 (96.0-100.0) | 96 (80.0-100.0) | |
Capillary non-adequate vs. Venous adequate | 74 | 74 | 98 (87.0-100.0) | 100 (86.0-100.0) | 100 (91.0-100.0) | 97 (84.0-100.0) | |
TPHA* | |||||||
Overall | 181 | 181 | 99 (94.0-100.0) | 100 (96.0-100.0) | 100 (96.0-100.0) | 99 (94.0-100.0) | |
Adequate samples | 106 | 106 | 98 (91.0-100.0) | 100 (93.0-100.0) | 100 (94.0-100.0) | 98 (89.0-100.0) | |
Capillary non-adequate vs. Venous adequate | 71 | 71 | 100 (86.0-100.0) | 100 (92.0-100.0) | 100 (86.0-100.0) | 100 (92.0-100.0) | |
