The best replacement for lavage is gavage.

The best alternatives to lavage are rated as following:
★★★★★  gavage
★★  wash
★★  bronchial wash
★★  transtracheal wash
★  paracentesis
★  emesis
★  bronchoscopy
★  gastric gavage
  bronchial washing

Your alternative for lavage is not listed? Suggest!
Speaking about lavage, one probably shouldn't forget about suction.

Other search terms related to lavage and their ratings are:
★★★★★ suction
★★★★ ng tube
You have in mind a companion for lavage and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of lavage in all years. Click on graph for more.
lavage
gavage
wash