Lactose intolerance laboratory findings

Lactose Intolerance Microchapters
Home
Patient Information
Overview
Historical Perspective
Classification
Pathophysiology
Causes
Differentiating Lactose Intolerance from Other Diseases
Epidemiology and Demographics
Risk Factors
Screening
Natural History, Complications and Prognosis
Diagnosis
Diagnostic Study of Choice
History and Symptoms
Physical Examination
Laboratory Findings
Electrocardiogram
Chest X Ray
CT
MRI
Echocardiography or Ultrasound
Other Imaging Findings
Other Diagnostic Studies
Treatment
Medical Therapy
Surgery
Primary Prevention
Secondary Prevention
Cost-Effectiveness of Therapy
Future or Investigational Therapies
Case Studies
Case #1
Lactose intolerance laboratory findings On the Web
Most recent articles
Most cited articles
Review articles
CME Programs
Powerpoint slides
Images
American Roentgen Ray Society Images of Lactose intolerance laboratory findings All Images X-rays Echo & Ultrasound CT Images MRI
Ongoing Trials at Clinical Trials.gov
US National Guidelines Clearinghouse
NICE Guidance
FDA on Lactose intolerance laboratory findings
CDC on Lactose intolerance laboratory findings
Lactose intolerance laboratory findings in the news
Blogs on Lactose intolerance laboratory findings
Directions to Hospitals Treating Lactose intolerance
Risk calculators and risk factors for Lactose intolerance laboratory findings

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mahda Alihashemi M.D. [2]

Overview

Laboratory findings consistent with the diagnosis of lactose intolerance include stool osmotic gap of >125 mOsm/kg, stool pH <6.

Laboratory Findings

• Laboratory findings consistent with the diagnosis of lactose intolerance include:
  • Stool osmotic gap of >125 mOsm/kg due to unabsorbed carbohydrates.
    • Normal Stool osmotic gap:  −290 [(Na+K) × 2]
  •  Stool pH <6 due to bacterial fermentation of unabsorbed lactose to hydrogen gas in the colon.