###HUMAN: what is the total dose heparin sodium that patient 11826 has been prescribed during their current hospital encounter?, ###ASSISTANT: SELECT SUM(prescriptions.dose_val_rx) FROM prescriptions WHERE prescriptions.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 11826 AND admissions.dischtime IS NULL) AND prescriptions.drug = 'heparin sodium'