instruction: count the number of patients who had delta abnormal lab test status and other specified perinatal disorders of digestive system.
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.short_title = "Perinat GI sys dis NEC" AND lab.flag = "delta"