If you have high-traffic areas or heavy clay soil, you will want to aerate every year. If you have sandy soil or your lawn is growing well, aerating the lawn.
Normal pulse oximeter readings usually range from 95 to 100 percent. Values under 90 percent are considered low, and indicate the need for supplemental oxygen.
The medical name for swollen lymph nodes is lymphadenopathy. In a child, a lymph node is considered enlarged if it is more than 1 centimeter (0.4 inch) wide.