instruction: get me the number of patients diagnosed with diverticulosis of colon with hemorrhage who had blood fluid lab test.
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN lab ON demographic.hadm_id = lab.hadm_id WHERE diagnoses.long_title = "Diverticulosis of colon with hemorrhage" AND lab.fluid = "Blood"