Last update: Aug. 6, 2017

Carbon-13 labelled Urea

Very Low Risk for breastfeeding

Safe. Compatible.
Minimal risk for breastfeeding and infant.

Carbon 13 is a natural, stable and non-radioactive isotope (Idifarm 2016, Osaka 2016) that is used to label urea for diagnostic purposes.

Since the last update we have not found any published data on its excretion in breast milk.

Urea is a natural component of the body and is also found in milk (Wheeler RA 1991, Ross SA 1985).

The dose of urea from the breath test to rule out infection by helicobacter pylori is 100 mg, an inconsequential amount since the endogenous production of urea is 25-35 g daily (AEMPS 2004).

Manufacturer's data indicate low risk for pregnancy and breastfeeding (Idifarm 2016, Isomed 2004).

See below the information of this related product:

  • Urea (Very Low Risk)


We do not have alternatives for Carbon-13 labelled Urea since it is relatively safe.

Suggestions made at e-lactancia are done by APILAM´s pediatricians and pharmacists, and are based on updated scientific publications.
It is not intended to replace the relationship you have with your doctor but to compound it.

Jose Maria Paricio, Founder & President of APILAM/e-Lactancia

Your contribution is essential for this service to continue to exist. We need the generosity of people like you who believe in the benefits of breastfeeding.

Thank you for helping to protect and promote breastfeeding.

José María Paricio, founder of e-lactancia.

Other names

Carbon-13 labelled Urea is also known as

Carbon-13 labelled Urea in other languages or writings:


Carbon-13 labelled Urea belongs to this group or family:


Main tradenames from several countries containing Carbon-13 labelled Urea in its composition:


Variable Value Unit
Oral Bioavail. 100 %
Molecular weight 76 daltons
Tmax 2 hours
T1/2 3 hours


  1. Idifarma. Urea C13 Drug Summary. 2016 Full text (in our servers)
  2. Otsuka. Urea C13. Dril Summary. 2016 Full text (in our servers)
  3. AEMPS. Urea C13. Ficha técnica. 2004 Full text (in our servers)
  4. Isomed. Urea-C13. Ficha técnica 2001 Full text (in our servers)
  5. Wheeler RA, Jackson AA, Griffiths DM. Urea production and recycling in neonates. J Pediatr Surg. 1991 Abstract
  6. Ross SA, Clark RM. Nitrogen distribution in human milk from 2 to 16 weeks postpartum. J Dairy Sci. 1985 Abstract

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e-lactancia is a resource recommended by Academy of Breastfeeding Medicine from United States of America

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