Drawing people's blood all day can get so repetitive, and yet every person you get its a new scenario. You never know if they're going to be an easy draw or have no usable veins at all. Old people and heavy people are usually the harder draws (except for kids of coarse). In heavier people half the time you cant see or feel any vein. This is never fun because those cases the veins are usually really deep so the whole needle has to go in to catch the vein (straights are more then an inch long too). Some older people you can see all their veins because their skin is paper thin, but that doesn't mean any of them are usable! It's always a little worry some when this happens because when your palpating for the vein it's sometimes hard to tell if its actually a vein or a tendon. The human body seems to soften with age making this a problem and you NEVER want to hit a tendon or bad BAD things will happen. Every time you call a new number for the patient to come in you never know what your going to get, so in this sense the phlebotomy hours are unpredictable and ever changing!