Can I take Urea C 14 while breastfeeding?

Information in this record refers to the use of urea C14 as a diagnostic agent. No information is available on the use of urea C14 during breastfeeding. However, administration of urea C14 directly to pediatric patients is considered to be safe.[1] The International Commission on Radiological Protection recommends that breastfeeding need not be interrupted after administration of urea C14.[2]

Drug levels

Carbon 14 is a low-energy beta emitter with a physical half-life of about 5730 years.

Effects in breastfed infants

Carbon 14 is a low-energy beta emitter with a physical half-life of about 5730 years.

Possible effects on lactation

Relevant published information was not found as of the revision date.

Alternate drugs to consider

Urea C 13


1. Pathak CM, Kaur B, Khanduja KL . 14C-urea breath test is safe for pediatric patients. Nucl Med Commun. 2010;31:830-5. PMID: 20864821

2. Mattsson S, Johansson L, Leide Svegborn S et al. Radiation dose to patients from radiopharmaceuticals: A compendium of current information related to frequently used substances. Annex D. Recommendations on breast-feeding interruptions. Ann ICRP. 2015;44 (2 Suppl):319-21. PMID: 26069086

Last Revision Date


Disclaimer:Information presented in this database is not meant as a substitute for professional judgment. You should consult your healthcare provider for breastfeeding advice related to your particular situation. The U.S. government does not warrant or assume any liability or responsibility for the accuracy or completeness of the information on this Site.

Source: LactMed – National Library of Medicine (NLM)

3D Model of the Urea C 14 molecule

MolView – data visualization platform

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