Stacy Sime – CEO of LifeServe Blood Center – says they have about a two-to-three day supply of blood on hand today – and that’s under the five-day supply that’s their target. Iowans may start donating blood at the age of 16, however 16 and 17 year olds must have a consent form signed by a parent to donate. Sime says blood drives in high schools last year generated 15-thousand units of blood for LifeServe. Governor Kim Reynolds donated blood at LifeServe location in Johnston Wednesday to call attention to the current blood shortage. Sime says her organization is supplying blood to ambulance services in Des Moines and West Des Moines.