A bad gas valve will not allow any gas to go to the burner or pilot light. See the article on 'Hot Water Heater Gas Valves' for the issues surrounding this device. A clogged or partially clogged vent can cause this problem. See Venting a Gas Water Heater for information on keeping your vent clear.
Definition. A hemoglobin test measures the amount of hemoglobin in your blood. Hemoglobin is a protein in your red blood cells that carries oxygen to your body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs. If a hemoglobin test reveals that your hemoglobin level is lower than normal, it means you have a low red blood cell count (anemia). Anemia can have many different causes, including vitamin deficiencies, bleeding and chronic diseases.
The hemoglobin A1c test is a simple lab test that shows the average amount of sugar that has been in your blood over the last 3 months. Your health care provider does the test by taking a small sample of your blood and sending it to a lab. The hemoglobin A1c test shows if your blood sugar is close to normal or too high. It is the best test for your health care provider to tell if your blood sugar is under control.