Experimental Factor Ontology id EFO_0007924 (tonsillectomy risk measurement) is quantification an individual's risk of undergoing tonsillectomy. Some individuals experience recurrent, severe tonsillitis and massive hypertrophy of the tonsils in which case surgical removal of the tonsils may be considered. There are a number of genetic variants that may reduce the risk of tonsillectomy by conferring a protective effect.