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When anchoring a vein for venipuncture why is it inadvisable to place one finger above the venipuncture site?

There are two reasons for this first is for safety. If the patient pulls the arm back when the needle is inserted the needle may recoil as it comes out of the arm, springing back into your finger. Also there is the possibility of contamination of the site that you just cleaned.


How long can tourniquet be left on arm for blood draw?

A tourniquet should be left on the arm for no longer than 1-2 minutes for a blood draw. Leaving it on for longer can lead to complications like tissue damage, nerve injury, or blood pooling. It's important to release the tourniquet once the needle is inserted to prevent any adverse effects.


Why are you not allowed to carry heavy objects after a blood test?

The fact that you just had a large needle in your arm means that there's now a fair-sized hole there. Putting any pressure on the arm could cause that hole to be torn open again, and cause bleeding and damage. So it is recommended that you avoid any lifting over the following day or so, to let it heal enough.


What is the input arm and the output arm on a lever?

The input arm, also known as the effort arm, is the distance from the pivot point to where the input force is applied. The output arm, also known as the load arm, is the distance from the pivot point to where the output force is exerted.


A lever has 36cm input arm and 6cm output arm. What is the MA?

The mechanical advantage (MA) of a lever is calculated by dividing the input arm length by the output arm length. In this case, the MA would be 36cm (input arm) divided by 6cm (output arm), resulting in a MA of 6.