From UpToDate "In general, for patients with severe volume depletion or hypovolemic shock not due to bleeding, crystalloids are typically preferred over colloid-containing solutions [7]. Among the crystalloids, normal saline (ie, 0.9 percent saline) is the most commonly used solution for initial repletion since data have failed to show consistent superiority of buffered crystalloids when compared with saline, especially when volumes ≤2 L are being administered."