One of its major roles is to prepare the lining of the uterus (the endometrium) to allow the embryo to implant and grow. In some of the treatment protocols progesterone is not produced by the ovary in adequate amounts, or its effect on the lining of the uterus is inadequate. This problem is called luteal deficiency. It is more common in older women and in women with abnormal ovulation.
Potassium chloride can be given orally in less serious situations or by IV in more serious situtations of potassium shortage. When given by IV, potassium chloride cannot be administered via IV push/bolus (or via IM or s.q.), because it would result in the patient receiving too much potassium too quickly; it must be diluted and infused over a certain period of time.
One way your body regulates blood potassium levels is by shifting potassium into and out of cells. When there is a breakdown or destruction of cells, the electrolyte potassium moves from inside of the cell to outside of the cell wall. This shift of potassium outside of the cells causes hyperkalemia. Potassium is excreted (or flushed out of your system) by your kidneys. Any damage to your kidneys, when they are not working properly, may cause an increase in potassium levels leading to hyperkalemia.