Given an incidental leukocytosis and mild hyperbilirubinemia, should I call the patient to ask about any symptoms?

Yes, Call the Patient to Assess for Symptoms

You should contact the patient to obtain a thorough clinical history and assess for symptoms, as these incidental findings warrant evaluation rather than simple repeat testing. The combination of mild leukocytosis (WBC 12.2) and elevated bilirubin (1.8) requires clinical context to determine appropriate next steps 1.

Why Contact is Necessary

The 2018 Gut guidelines explicitly state that simply repeating abnormal tests is not recommended unless there is high clinical suspicion of a transient finding 1. Instead, the first abnormality should trigger investigation of the etiology. Since 84% of abnormal liver tests remain abnormal at 1 month and 75% at 2 years, a "wait and see" approach is inefficient and potentially delays diagnosis 1.

Critical History Elements to Obtain

When you call, systematically assess for:

For the Hyperbilirubinemia:

• Jaundice (visible yellowing of skin/eyes) - if present, this requires immediate referral 1
• Abdominal pain, particularly right upper quadrant
• Dark urine or pale stools
• Pruritus (itching)
• Weight loss
• Alcohol intake (current and past, quantified in units per week)
• Complete medication history: prescribed, over-the-counter, herbal supplements
• Features of metabolic syndrome: obesity, diabetes, hypertension
• Family history of liver disease or Gilbert's syndrome
• Recent illness or fasting (can unmask Gilbert's syndrome)

For the Leukocytosis:

• Fever or recent infections 2, 3
• Recent surgery, trauma, or physical/emotional stress 2, 3
• Current medications, especially corticosteroids, lithium, or beta-agonists 3
• Smoking status 2
• Constitutional symptoms: unexplained weight loss, night sweats, fatigue, bruising, or bleeding (concerning for malignancy) 2, 4
• Known chronic inflammatory conditions 2

Interpretation Framework

The Bilirubin (1.8 mg/dL):

The most common cause of isolated mild hyperbilirubinemia is Gilbert's syndrome, which is benign and requires reassurance only 1. However, you need to:

• Determine if this is conjugated vs. unconjugated bilirubin (request fractionation if not already done) 5
• If predominantly unconjugated and no hemolysis, Gilbert's syndrome is virtually certain 1
• If conjugated, consider hepatocellular disease or biliary obstruction 1, 5

The Leukocytosis (12.2):

This mild elevation is most commonly due to:

• Infection or inflammation (most common) 2, 3
• Physiologic stress responses 2, 3
• Medications 3
• Smoking or obesity 2

A WBC of 12.2 is not alarming on its own, but requires clinical correlation 2, 3.

Next Steps Based on Your Call

If the patient is asymptomatic with no concerning history:

• Request a peripheral blood smear with differential to assess white cell types and maturity 2, 4
• Order fractionated bilirubin if not already done 5
• Consider checking other liver enzymes (ALT, AST, alkaline phosphatase) as part of a core liver panel 1
• Calculate AST:ALT ratio if both available (ratio >1 suggests advanced fibrosis even with normal values) 1

If concerning symptoms are present:

• Visible jaundice or suspicion of malignancy = immediate referral 1
• Constitutional symptoms (fever, weight loss, bruising, fatigue) = hematology referral to exclude malignancy 2, 4
• Abdominal pain with jaundice = urgent hepatobiliary evaluation 1

Common Pitfalls to Avoid

• Don't just repeat the same tests without clinical assessment - this is explicitly discouraged and cost-ineffective 1
• Don't assume mild abnormalities are benign - significant liver disease can exist with normal or minimally elevated values 1
• Don't overlook medication causes - many common drugs cause both leukocytosis and liver abnormalities 3
• Don't miss the combination - while each finding alone may be benign, their co-occurrence could indicate an acute process (infection, cholangitis) that requires prompt attention 6

The extent of abnormality does not determine clinical significance - context does 1. A phone call takes minimal time and provides the clinical context necessary to determine whether these are benign incidental findings (like Gilbert's syndrome with stress leukocytosis) or harbingers of significant disease requiring urgent intervention.