Assertion: obstruction | /r/HasProperty | blocked kidney
Facets:
value: for several hours
type: TEMPORAL
value: completely
type: DEGREE
Source sentences:
text: Blood test results are usually normal (particularly if obstruction is partial or acute), but tests may reveal high levels of blood urea nitrogen (sometimes called BUN), creatinine, or both if obstruction has completely blocked both kidneys for more than several hours.
text: Immediate action may be necessary if unusual levels of creatinine, urea nitrogen, or both are present when the obstruction has blocked both kidneys for several hours.