Photographs of intestines and selected hematologic indices. (A) Intestines from rat 49, group K, 24 h after ketoprofen injection. Darkened serosal surfaces indicative of bleeding into the intestines. PCV, 22% below baseline; total protein, 4.6 g/dL below baseline. (B) Normal intestines from rat 18, group S+A, 24 h after saline injection and anesthesia. The thin arrow points to the normal color of intestinal loops; the thick arrow indicates the normal color of the cecum. PCV, 2% below baseline; total protein, 0.1 g/dL below baseline. (C) Intestines from rat 21, group K+A, 24 h after injection of ketoprofen and anesthesia. The thin arrow points to darkened intestinal loops, indicative of blood in the intestines. The thick arrow points to the dark-red cecum, indicative of blood in the lower intestines. PCV, 15% below baseline; total protein, 3.7 g/dL below baseline. (D) Intestines from rat 15, group K+A, 24 h after injection of ketoprofen and anesthesia. The thin arrow points to darkened intestinal loops, indicative of blood in the intestines. The thick arrow points to the dark-red cecum, indicative of blood in the lower intestines. PCV, 20% below baseline; total protein, 2.6 g/dL below baseline.