A standard twin mattress is 39 by 75 inches. A king is 76 by 80 inches. This means that a headboard for a king bed is going to be about 76 inches or wider, plenty wide enough to go along the length of a twin bed. Headboards are often slightly wider than the bed for which they are made.
Hemoglobin, Hematocrit, Blood Count. In order to donate blood, a woman must have a hemoglobin level of at least 12.5 g/dL, and a man must have a hemoglobin level of at least 13.0 g/dL. For all donors, the hemoglobin level can be no greater than 20 g/dL.
You may NOT donate blood. Hemophilia or related clotting disorder. You may NOT donate blood. Hereditary Spherocytosis. You may NOT donate blood. Histoplasmosis. You may donate if your x-ray shows inactive disease. HIV. You may not NOT donate blood.