ABP Pediatric Gastroenterology common mistakes
ABP Pediatric Gastroenterology · Understand the traps and how to avoid them.
Committing to a single diagnosis (e.g., simple constipation) before systematically excluding red-flag mimics such as Hirschsprung disease, hypothyroidism, or tethered cord when a child presents with chronic constipation and poor growth.
Trainees pattern-match to the most frequent community diagnosis and stop generating alternatives once one fits, a classic premature-closure heuristic reinforced by outpatient volume pressure.
What to do instead
Before finalizing, explicitly list and rule in/out at least two alternative diagnoses using targeted history, growth trajectory, and first-line tests (e.g., rectal biopsy, TSH, sacral exam) and document the reasoning.
Interpreting a single normal or mildly abnormal growth point (weight, height, BMI) as reassuring and failing to plot serial measurements on the correct chart (WHO vs CDC, corrected age for prematurity).
Candidates read numbers in isolation rather than as trajectories and are unfamiliar with which chart applies at which age, so they miss faltering growth or a crossing of centile lines.
What to do instead
Always plot at least three serial points on the age-appropriate chart, apply corrected age under 24 months, and interpret velocity and centile crossing rather than absolute values.
Ordering or interpreting celiac serology (tTG-IgA) without confirming adequate total IgA, and mislabeling a positive result as diagnostic without a plan for duodenal biopsy or recognized no-biopsy criteria.
Candidates memorize tTG-IgA as 'the test' but forget IgA deficiency causes false negatives and that serology alone is not universally diagnostic, especially in adults or equivocal titers.
What to do instead
Pair tTG-IgA with total IgA every time; if IgA deficient, use IgG-based assays; and state the confirmatory pathway (biopsy on gluten-containing diet or explicit pediatric no-biopsy criteria) in your answer.
Failing to distinguish conjugated (direct) from unconjugated hyperbilirubinemia in a neonate and treating any jaundice as physiologic.
Physiologic jaundice is so common that candidates anchor on it, and they underweight the fractionation of bilirubin, which is the pivotal branch point for cholestasis and biliary atresia.
What to do instead
For any jaundice beyond two weeks or with pale stools/dark urine, fractionate bilirubin; a conjugated fraction above threshold mandates urgent evaluation for cholestasis and biliary atresia.
Missing the time-critical window for biliary atresia by attributing persistent jaundice with acholic stools to breast-milk jaundice and delaying stool-color assessment and hepatobiliary referral.
Breastfeeding-associated jaundice is common and benign, so candidates discount the acholic stool and conjugated hyperbilirubinemia that signal a surgical emergency with outcome dependent on age at Kasai.
What to do instead
Treat acholic stools plus conjugated hyperbilirubinemia as a surgical-clock emergency: order stool color card review, fractionated bilirubin, and same-week hepatology/surgical referral, and state the age-dependent outcome explicitly.
Managing acute pancreatitis or gastrointestinal bleeding without first stabilizing and risk-stratifying (fluids, severity scoring, transfusion thresholds, endoscopy timing) before pursuing an etiologic workup.
Candidates jump to diagnostic curiosity (ordering every cause) and neglect the resuscitative and disposition decisions that drive outcomes and dominate exam weighting.
What to do instead
Structure answers as stabilize, stratify, then investigate: address volume status, severity indices, and procedure timing in the first sentences, and only then list etiologic tests.
Choosing the wrong endoscopic or diagnostic test for a presentation (e.g., upper endoscopy for suspected lower GI bleeding, or imaging-first for suspected foreign body versus endoscopic removal) and misstating preparation, sedation, or contraindications.
Candidates conflate indications across procedures and underlearn practical logistics such as bowel prep, anesthesia risk, and when endoscopy is diagnostic versus therapeutic.
What to do instead
For each procedure, rehearse indication, contraindication, preparation, and diagnostic-versus-therapeutic role as a four-part checklist, and match the anatomic site to the modality before answering.
Under-recognizing extraintestinal and immune-mediated manifestations (e.g., growth failure and perianal disease in Crohn disease, or the non-GI clues of celiac and eosinophilic disorders) and treating gut symptoms in isolation.
Compartmentalized thinking keeps candidates inside the GI tract and they forget that pediatric inflammatory and immune conditions present systemically and affect growth and development.
What to do instead
For every chronic GI presentation, systematically screen growth, nutrition, perianal/skin, joint, and hematologic clues, and integrate them into the differential and management plan.
Failing to apply age- and weight-based dosing, fluid, and nutrition calculations correctly (e.g., maintenance fluids, TPN components, or elemental formula volumes) when managing malabsorption or short bowel.
Candidates rely on adult-anchored numbers or memorized formulas without checking units, weight basis, or the specific needs of malabsorptive states, producing order-of-magnitude errors.
What to do instead
Show the calculation with units and weight basis explicitly, sanity-check the result against expected ranges, and adjust for ongoing losses and malabsorption rather than using standard maintenance alone.
Neglecting scholarship and professionalism elements: not citing guideline-based practice, ignoring shared decision-making and family context, or failing to recognize when to escalate or refer.
Candidates treat these as soft domains and focus solely on pathophysiology, so they omit guideline concordance, communication, and appropriate referral thresholds that exam items reward.
What to do instead
Anchor management in named guideline-based standards, explicitly address family communication and shared decision-making, and state referral/escalation criteria as part of the plan.