Free range Advantages: It's fun and you get to see the chickens run all around. They also eat healthy stuff (and bugs) in the yard. Disadvantages: The mess (droppings plus scratched up plants/grass/yard) is not contained, and the droppings can end up in places like your driveway.
Magnesium deficiency can be associated with malnutrition, malabsorption, chronic diarrhea, and alcoholism. A Magnesium RBC test can provide an earlier indicator of Magnesium deficiency that a standard Magnesium blood test. When levels are low, the body will pull Magnesium from the cells to keep blood levels normal. In this case a Magnesium blood test may show normal levels while a Magnesium RBC test will give a more accurate result.
Since magnesium is an electrolyte, a magnesium test may be ordered along with other electrolytes such as sodium, potassium, chloride, bicarbonate (or total CO2), calcium, and phosphorus to evaluate a person's electrolyte balance. If magnesium is low, it is not unusual for potassium also to be low.