Card 26 / 34: A 68 year old man complains of chronic peri-umbilical abdominal discomfort. He has had diarrhea for many years of unclear cause. He has lost 15 lbs in the past year unintentionally. He used to drink alcohol heavily up until 5 years ago. His blood sugar is normal. Which of the following will most likely help you diagnosis chronic pancreatitis?
1.) Serum amylase level
2.) Serum calcium level
3.) Low vitamin B12
4.) Abdominal CT scan
5.) Lactose tolerance test

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