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.
At home. If you become unwell (other than a cold or cold-sore) within 2 weeks following your donation, or if you believe there is a reason your blood should not be given to a patient, please call our donor helpline on 0300 123 23 23. Please do not have a hot bath on the day of your donation.