Table 4.

Reference values of plasma i-FABP, LPS, and d-la in healthy individuals

Biomarker	Median (IQR, 25%–75%)
i-FABP (pg/mL)	31.32 (24.54–34.87)
LPS (pg/mL)	2.65 (1.17–3.45)
d-la (μmol/L)	8.21 (3.23–10.37)

Values were obtained from 50 volunteers (men, 40%) with a mean age of 47 ± 15 years. The volunteers were recruited from communities in Changchun, and were adults without any history of malignancy, infections, or gastrointestinal disease in the last 3 months

d -la d-lactate, i-FABP intestinal fatty acid–binding protein, IQR interquartile range, LPS lipopolysaccharide