What is the reference range for Faecal Calprotectin?

The standard reference range for Faecal Calprotectin is 120 µg/g elevated.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Faecal Calprotectin?

Faecal Calprotectin is measured in 2 tests on BiomarkersLabs.com, including Comprehensive Stool Analysis + Parasitology - 1 Day, GI Effects Comprehensive Profile – 1 Day (Stool).

Biomarker Reference · Calprotectin

What does the Faecal Calprotectin test measure?

Faecal Calprotectin (Calprotectin) is a clinical biomarker used in microbiome-gut assessment. Calprotectin is a calcium- and zinc-binding protein released by neutrophils that infiltrate the intestinal mucosa during inflammation. It is measured in 2 laboratory tests on BiomarkersLabs.com.

Reference Range: <50 µg/g generally considered normal; 50–120 µg/g equivocal; >120 µg/g elevated.
Units: µg/g, mg/kg
Measured In: 2 tests
Category: —

Functional medicine optimal<50 µg/g; values 50–150 µg/g are equivocal and may reflect mild inflammation, recent NSAID use, or technical variation; >150–250 µg/g indicates significant mucosal inflammation.

What is Faecal Calprotectin?

Calprotectin is a calcium- and zinc-binding protein released by neutrophils that infiltrate the intestinal mucosa during inflammation. Its concentration in stool correlates with the degree of mucosal leucocyte activity, making it a sensitive marker of intestinal inflammation. The protein is stable in stool at room temperature for several days, which facilitates home collection.

Why is Faecal Calprotectin measured?

Elevated calprotectin distinguishes organic inflammatory disease (Crohn's disease, ulcerative colitis, infectious colitis) from functional disorders such as irritable bowel syndrome. It is used to screen for IBD in patients with chronic diarrhoea, to monitor disease activity, and to detect subclinical relapse. Values above 150–250 µg/g strongly suggest active inflammation warranting endoscopy.

Reference ranges

Standard reference: <50 µg/g generally considered normal; 50–120 µg/g equivocal; >120 µg/g elevated.
Functional medicine optimal: <50 µg/g; values 50–150 µg/g are equivocal and may reflect mild inflammation, recent NSAID use, or technical variation; >150–250 µg/g indicates significant mucosal inflammation.
Units: µg/g, mg/kg

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure Faecal Calprotectin

2 tests on BiomarkersLabs.com include this biomarker.

BML-MBG-013Comprehensive

Comprehensive Stool Analysis + Parasitology - 1 Day

Faecal Calprotectin reference range in this test: Typically <50 µg/g; laboratory-specific cut-offs may range from 50–150 µg/g.

BML-GAS-045Comprehensive

GI Effects Comprehensive Profile – 1 Day (Stool)

Faecal Calprotectin reference range in this test: <50 µg/g generally considered normal; 50–120 µg/g equivocal; >120 µg/g elevated.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Secretory Immunoglobulin AsIgA2 tests Short-Chain Fatty Acids (Acetate, Propionate, Butyrate)SCFA4 tests Commensal Bacterial FloraCommensal Flora1 test Opportunistic and Pathogenic BacteriaOpportunistic Pathogens1 test Yeast and Fungal OrganismsYeast1 test Parasites (Ova, Cysts, Trophozoites)Parasites2 tests Faecal Elastase-1Elastase-11 test Faecal pHpH2 tests

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