Gastrointestinal

D-xylose absorption (after ingestion of 25 g of D-xylose) — Urine excretion: 5-8 g at 5 h (33-53 mmol); serum D-xylose: greater than 20 mg/dL at 2 h (1.3 nmol/L)

Fecal urobilinogen — 40-280 mg/24 h (68-473 µmol/ 24 h)

Gastric secretion — Basal secretion: male: 4.0 ± 0.2 meq of HCl/h (4.0 ± 0.2 mmol/h); female: 2.1 ± 0.2 meq of HCl/h (2.1 ± 0.2 mmol/h); peak acid secretion: male: 37.4 ± 0.8 meq/h (37.4 ± 0.8 mmol/h); female: 24.9 ± 1.0 meq/h (24.9 ± 1.0 mmol/h)

Gastrin, serum — 0-180 pg/mL (0-180 ng/L)

Lactose tolerance test — Increase in plasma glucose: greater than 15 mg/dL (0.83 mmol/L)

Lipase, ascitic fluid — Less than 200 U/L

Secretin-cholecystokinin pancreatic function — Greater than 80 meq/L (80 mmol/L) of HCO3 in at least 1 specimen collected over 1 h

Stool fat — Less than 5 g/d on a 100-g fat diet

Stool nitrogen — Less than 2 g/d

Stool weight — Less than 200 g/d

From MKSAP 12 ©2000, 2001, 2002. American College of Physicians—American Society of Internal Medicine