Routine blood tests do not require a lot of blood to be drawn from the site, and can be performed as long as the relevant blood can be collected. The simplest way is to take blood from the terminal fingertip, which is punctured with a needle and then dripped out, and then a capillary tube can be used to aspirate the blood for routine blood analysis. A more common method is to take blood from a vein, which is mostly taken from the elbow vein in the elbow fossa. This area is more accurate for routine blood tests than peripheral blood, and it is perfectly acceptable to take venous blood from other areas for testing. It is also possible to use arterial blood for laboratory tests, but it is very uncommon in clinical practice, because arterial blood takes longer to compress and is more difficult to collect, and there is no improvement in testing accuracy. So taking venous blood for routine blood tests is perfectly adequate.