Immuchrom logo - Manufacturer of the Bile Acids assay for Human Stool, distributed by Ilex Life Sciences.

Bile Acids Assay for Human Stool (ImmuChrom)

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Intended Use

The Immuchrom Bile Acids Assay Kit is photometric test that enables easy, rapid and precise quantitative determination of free bile acids in human stool samples. For research use only.


Bile acids play a significant role in the absorption of lipids and fat-soluble vitamins in the small intestine, as well as in the excretion of cholesterol. Furthermore, they contribute to the stimulation of intestinal motility.

Bile acids function, among other things, in the digestion of fats, are formed in the liver and released into the duodenum with the bile. In the last section of the small intestine, about 95-97% of the bile acids are reabsorbed (enterohepatic circulation).

If the absorption of bile acids in the small intestine is impaired, they are increasingly excreted in the stool, which leads to irritation of the colon and causes severe diarrhea, resulting in severe fluid loss as well as vitamin and mineral deficiencies. This is called bile acid malabsorption syndrome or chologenic diarrhea.

The ImmuChrom bile acids kit allows an easy, rapid and precise quantitative determination of bile acids in stool samples. The kit includes all reagents ready to use for preparation of the samples.

Regulatory Status

Research Use Only (RUO)


Photometric assay

Other names

steroid carboxylic acids, cholic acid, chenodeoxycholic acid

Principle of Method

The quantitative determination of bile acids is carried out via their enzymatic oxidation to 3-keto steroids with the formation of thio-NADH. The resulting change in absorbance (ΔOD) at 405 nm is determined photometrically. The concentration can be calculated from the standard curve.

Sample Types


Sample Volume

Extraction in stool extraction vials

The bile acids are extracted by the extraction buffer out of the stool sample. Extraction in stool extraction vials In a stool sample extraction vial mix 15 mg stool with 1.5 ml EXT, then vortex it until the mixture is homogenous. Transfer the resulting slurry to a plastic vial and centrifuge it for 10 min at 3000xg.

The supernatant is directly pipetted into the microtiter plate wells with no further dilution.

Standard Curve

Example of a standard curve with the Bile Acids assay for Human Stool (ImmuChrom), distributed by Ilex Life Sciences.

Calibration Range:  9 - 280 µmol/L

Limit of Detection

1.91 µmol/L

For the determination, the zero-standard was measured 12 times. The 3-fold standard deviation was added to the mean value. The respective concentration was read from the standard curve.

Intra-assay (Within-Run) C.V.

6.0 %

Inter-assay (Run-to-Run) C.V.

10.4 %


Ilex Life Sciences LLC is an official distributor of Immuchrom GmbH.

References to Summary

Neumeister, B.: Klinikleitfaden Labordiagnostik. Elsevier Urban & Fischer, München 2009

Pschyrembel. Klinisches Wörterbuch. 266. Auflage. De Gruyter, Berlin 2014

Stephen D. Turley and John M. Dietschy: Re-evaluation of the 3α-hydroxysteroid dehydrogenase assay for total bile acids in bile; Journal of Lipid Research Volume 19 Notes on Methodology 1978: 924-928

Priya Vijayvargiya, Michael Camilleri, Andrea Shin and Amy Saenger: Methods for Diagnosis of Bile Acid Malabsorption in Clinical Practice; CLINICAL GASTROENTEROLOGY AND HEPATOLOGY 2013; Vol. 11: 1232–1239

Jack L. Porter, John S. Fordtran, Carol A. Santa Ana, Michael Emmett, Lee R.Hagey, Edith A. MacDonald, and Alan F. Hofmann: Accurate enzymatic measurement of fecal bile acids in patients with malabsorption; JOURNAL OF LABORATORY AND CLINICAL MEDICINE, July 2003 (