Final answer:
Abnormally low magnesium levels in the blood due to loss in urine is called hypomagnesemia. This condition is associated with several symptoms and can affect overall health.
Step-by-step explanation:
The condition of abnormally low magnesium in blood due to loss in urine is known as hypomagnesemia. This condition is different from hypokalemia, which is a decrease in potassium levels, hyponatremia, which is a reduction in sodium levels, and hypercalcemia, which implies elevated calcium levels. Hypomagnesemia can cause a variety of symptoms and may be associated with other electrolyte disturbances.