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Table 5 Classification and diagnostic value of the different combinations of the independent criterias predicting haemoperitoneum ≥ 300 ml

From: Ultrasound assessment of haemoperitoneum in ectopic pregnancy: derivation of a prediction model

  Patients with the characteristic probability of haemoperitoneum ≥ 300 ml Se (%) Sp (%) LR + LR -
Overall population 89 0.54     
Low risk of massive haemoperitoneum       
   Absent to mild pelvic pain AND Hb ≥ 10 g/dL AND no fluid above the uterus or around the ovary at TVUS 19 0.05 97.9* 43.9* 1.75* 0.05*
High risk of massive haemoperitoneum       
   Moderate to severe pelvic pain AND Hb <10 g/dL 14 0.93 27.1 97.6 11.10 0.75
   Moderate to severe pelvic pain AND fluid above the uterus or around the ovary at TVUS 20 0.95 39.6 97.6 16.23 0.62
   Two criteria present † 27 0.93 52.1 95.1 10.68 0.50
   All of the 3 criteria present † 7 1.00 14.6 100.0 0.85
  1. Hb = serum haemoglobin concentration. TVUS = transvaginal ultrasound examination.
  2. * Calculated for the absence of the disease. † All women with fluid above the uterus or around the ovary at transvaginal ultrasound examination and Hb < 10 g/dL had moderate to severe pain.