instruction: how many patients whose diagnoses long title is nonspecific elevation of levels of transaminase or lactic acid dehydrogenase [ldh] and lab test category is hematology?
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 = "Nonspecific elevation of levels of transaminase or lactic acid dehydrogenase [LDH]" AND lab."CATEGORY" = "Hematology"