1 Why the test is used: Between 75% and 90% of people with lupus have a positive anti-dsDNA test. 2  Also, the test is very specific for lupus. 3  Therefore, a positive test can be useful in confirming a diagnosis. 4  For many people, the titer, or level, of the antibodies rises as the disease becomes more active.
The zone below ground where the pore spaces are filled with ground water is called the saturated zone. Above the saturated zone, where the pore spaces are not filled with ground water, is the unsaturated zone. The water table marks the boundary between the saturated and unsaturated zone. The water table intersects Earth's surface at rivers and at lakes.
If a person digs a well to a depth where water is encountered, the depth at which the water is first encountered identifies the uppermost boundary of the water-saturated soil. Stated another way, it is the upper boundary at which all the spaces between the soil particles are filled with water. Thus, all the soil below this depth comprises the saturated  soil zone. The water surface in the well coincides with the upper boundary of the groundwater, and is commonly called the water table .