instruction: tell me the number of patients with delta abnormal lab test status who have diagnoses icd9 code 25002.
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.icd9_code = "25002" AND lab.flag = "delta"