Diagnostic Approach for Upper Abdominal Pain in Teenage Females

Initial Evaluation

The American Academy of Family Physicians recommends ultrasonography as the initial imaging study of choice for evaluating upper abdominal pain in a teenage female without fever, vomiting, diarrhea, or constipation, due to its effectiveness in reducing radiation exposure and evaluating gallbladder pathology, liver abnormalities, and pancreatic conditions 1, 2
A pregnancy test should be performed for all teenage females of reproductive age before any imaging studies, as recommended by the American Academy of Family Physicians 1, 3

Complete blood count (CBC) and liver function tests (LFTs) should be performed to assess for leukocytosis and hepatobiliary disease, respectively, with a strength of evidence level of moderate to high 3
Pancreatic enzymes (amylase and lipase) and renal function tests (BUN, creatinine) should be evaluated to rule out pancreatitis and assess kidney function, respectively, with a strength of evidence level of moderate to high 3
Ultrasonography of the abdomen is the first-line imaging modality for upper abdominal pain, and is highly effective for evaluating gallbladder pathology, liver abnormalities, and pancreatic conditions, with a strength of evidence level of high 1, 2

For right upper quadrant pain, ultrasonography is particularly valuable for evaluating gallbladder pathology, liver abnormalities, and hepatobiliary tract disease, with a strength of evidence level of high 1, 2, 3
For left upper quadrant pain, ultrasonography can evaluate splenic pathology, pancreatic conditions, and left kidney abnormalities, with a strength of evidence level of moderate to high 3

If ultrasonography is non-diagnostic and symptoms persist, CT of the abdomen and pelvis with contrast or MRI may be considered as a second-line imaging study, with a strength of evidence level of moderate to high 1, 4
Conventional radiography (plain X-rays) has limited diagnostic value in evaluating upper abdominal pain and should not be routinely used, with a strength of evidence level of low 1, 2

Failing to obtain a pregnancy test before imaging studies in females of reproductive age can lead to unnecessary radiation exposure, with a strength of evidence level of high 1, 3
Relying solely on laboratory tests without appropriate imaging when indicated can lead to delayed diagnosis, with a strength of evidence level of moderate to high 3
Using CT as first-line imaging due to radiation exposure concerns in younger patients can lead to increased radiation exposure, with a strength of evidence level of high 1