Blood donors were randomized to one of three arms after donation of 500cc of blood. The control group received no intravenous fluids, while donors in the two intervention arms wither received two liters normal saline or lactated ringers. Chemistries and blood gases were obtained before donation, after donation and after resuscitation. Donors hemoglobin levels were then compared over time and between study arms. Additionally, lactate and base deficit, which are markers of shock, will be collected at the time points as well to measure their response to resuscitation. Standard statistical tests were used to compare the laboratory values between groups.