TNF and endometriosis: The LRs for the peritoneal TNF-α in patients with endometriosis were calculated by Bedaiwy et al., The authors reported TNF-α concentration of 20 pg/mL, a 96% sensitivity and a 95% specificity (positive LR of 19.2 and negative LR of 0.04) at a cut-off peritoneal fluid [95].