Appropriate diagnostic testing varies based on the clinical situation. A complete blood count is appropriate if infection or blood loss is suspected.
In patients with epigastric pain, simultaneous amylase and lipase measurements are recommended because an elevated lipase level with a normal amylase level is not likely to be caused by pancreatitis.13 Liver chemistries are important in patients with right upper quadrant pain. A urinalysis should be obtained in patients with hematuria, dysuria, or flank pain. A urine pregnancy test should be performed in women of childbearing age who have abdominal pain to narrow the differential diagnosis and to determine whether certain imaging studies are appropriate. Testing for chlamydia and gonorrhea is recommended for women at risk of sexually transmitted infections.Level of Urea should also be assessed.
INVESTIGATIONS FOR ACUTE PAIN:
An chest xray might show air under the diaphragm which is suggestive of perforation and a plain abdominal flim might show evidence of obstruction or ileus(inability of the intestine to contract normally).An abdominal ultrasound may indicate the presence of gall stones or renal stones.Ultrasonography reveals free fluid and detection of any abdominal abscess.Diagnostic Laprotomy should be considered when no investigation is applicable.
INVESTIGATIONS FOR CHRONIC PAIN:
Endoscopy or Ultrasound: If suggestive of Gall bladder disease or epigastric pain.
Colonoscopy: Is indicated in patients with rectal bleeding, altered bowel habits and obstruction suggestive of celiac diseases.
CT and MR angiography: Should be considered when pain is provoked by food in a patient with wide spread atheroscelerosis since this may lead to mesenteric ischaemia.
In a young patients with pain relieved by defecetion, bloating and alternating bowel habit are likely to have irritable bowel syndrome.
Ultrasound, CT and Faecal elastic are required for patients with upper abdominal pain radiating to back. A history of alcohol misuse, weight loss and diarrohea suggest pancreatic cancer or chronic pancreatitis.
Recurrent attacks of pain in the loins radiating to the flank with urinary symptoms suggest of ureteric stones. It is investigated by abdominal X-ray, ultrasound and CT urography.
Repeated negative result or vague symptoms which don’t fit any disease or organ and history of psychiatric disturbances suggests psychological origin.
Stool DNA Test: A noninvasive laboratory test that identifies DNA changes in the cells of a stool sample. A stool DNA test looks for an shed cells from polyps cells or cancer cells.
Flexible Sigmoidoscopy: It is similar to colonoscopy except doesn’t examine entire colon. The doctor can only see less than half of the colon and the entire rectum.
Fecal Immunochemical test: This test is used to detect colorectal cancer to look for occult blood in the stool.
Urine culture: It is used to rule out UTI.