instruction: how many days has elapsed since the first time during their current hospital visit patient 28443 had received a creatine kinase (ck) lab test?
response: SELECT 1 * (STRFTIME('%j', CURRENT_TIME()) - STRFTIME('%j', labevents.charttime)) FROM labevents WHERE labevents.itemid IN (SELECT d_labitems.itemid FROM d_labitems WHERE d_labitems.label = 'creatine kinase (ck)') AND labevents.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 28443 AND admissions.dischtime IS NULL) ORDER BY labevents.charttime LIMIT 1