We just admitted a pt to home health who had a Bard Solo single lumen PICC placed on 12/11. Admitted to HH on 12/15 with blood return and flushed well. The primary MD ordered saline and heparin flushes and hospital records had saline flushes only documented. On 12/16 the nurse went to get labs and could not get a blood return. Can the heparin actually cause a problem with the valved PICCs? Any ideas?