Hubbies operation is scheduled for 29th Feb. He had his pre-assessment yesterday 19th Feb. and had a blood test. He's a bit concerned that at this pre-assessment he was told he would have to have another blood test 2 to 4 days before the operation, something that he's never had to do with his 3 previous pre-assessments even though these were all done 3 to 4 weeks before his ops. Is this normal?