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

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

	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

Hb = serum haemoglobin concentration. TVUS = transvaginal ultrasound examination.
* 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.

ISSN: 1749-7922