What amount "urine" actually detects thc levels?

Don't understand ?: Are you asking how much urine has to be provided to have a valid test, or what the levels of thc have to be in urine to be detected? Both questions have variable answers, depending on which test is being used. Some tests require literally a drop of urine on a test strip for validity, others require a minimum of 10 cc. Some tests will detect as little as 5 ng/ml of thc, others report at 50 ng/ml.