A 4 month old girl was being prepped for surgery for a neural tube defect. All lab results were normal except her D-dimer result, which was greater than 20,000 ng/mL FEUs. The girl was in apparent good health, but the surgeon postponed surgery. The test was repeated after three days and the new D-dimer result was greater than 11,000 ng/mL FEUs. The usual reference limit for D-dimer is 500 ng/mL. What might have caused her implausibly elevated D-dimer?
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