Percutaneous electrical nerve stimulation (PENS) is used to relieve pain and is essentially. the same as transcutaneous electrical nerve stimulation (TENS) except that, unlike TENS, the stimulating electrodes are surgically implanted around, or immediately adjacent to, the. nerve serving the painful area.
This prevents donation. Eating. foods high in iron, such as tuna, lean red meat, eggs, nuts, beans, dark green vegetables, raisins or taking a. multi-vitamin with iron may help bring the iron level to. the acceptable range for plasma donation. down those fluids.
When trying to overcome anemia, it's best to avoid eating foods with high levels of oxalic acid - rhubarb, tomatoes, spinach, and chocolate - because oxalic acid can interfere with the absorption of iron from non-plant sources. However, spinach can be boiled for a minute in order to reduce the oxalic acid levels.