###HUMAN: how many patients whose diagnoses long title is neonatal hypoglycemia and lab test category is chemistry?, ###ASSISTANT: 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 = "Neonatal hypoglycemia" AND lab."CATEGORY" = "Chemistry"