<prompt> In a patient with anemia, a low MCV and a negative fecal occult blood, indicates the possibility of which gastrointestinal disease?Peptic ulcer diseaseAlcoholic liver diseaseHookworm infestationCeliac disease  <response>: Lab parameters and diagnosis in Patients with Blood loss: A low MCV and negative fecal occult blood test-possibility of celiac disease. A high MCV 100 fL -chronic liver disease folate vitamin B12 deficiency. An elevated white blood cell count -greater severity of bleeding. A low platelet count -suggests chronic liver disease or a hematologic disorder. BUN level typically increases after GI bleed. The prothrombin time PT and international normalized ratio INR - elevated in chronic liver disease or with the use of warfarin. Low serum albumin -Possible chronic liver disease, malnutrition, or protein loss the intestine or kidney Ref: Sleisenger and Fordtrans, E-9, P-290 