Table 1. Criteria for evaluation of satisfactory placement and tubal occlusion on hysterosalpingogram (HSG).

Placement
Satisfactory	• Distal end of the inner coil being within the tube with less than half of the length of the inner coil trailing into the uterine cavity
	• Proximal end of the inner coil is up to 30 mm into the tube from the cornua
Unsatisfactory	• Absence of the microinsert on imaging (implying expulsion)
	• More than half of the length of the inner coil trailing into the uterine cavity
	• Proximal end of the microinsert in the tube more than 30 mm from the cornua
	• Presence of the microinsert within the peritoneal cavity

Occlusion
Satisfactory (grade 1)	• Complete non-filling of the tubes
Satisfactory (grade 2)	• Filling of the tubes but not beyond the distal-most aspect of the outer coil
Tubal patency (grade 3)	• Contrast beyond the outer coil
	• Spill into the peritoneal cavity