Atlantic Horseshoe Crabs and endotoxin testing: perspectives on alternatives, sustainable methods, and the 3Rs (Replacement, Reduction, and Refinement)
Open accessAbstract
Endotoxin testing is a vital part of quality and safety control in pharmaceutical production. The primary method for this testing in North America and Europe is the Limulus Amoebocyte Lysate (LAL) test, a critical component of which is the blood of Atlantic horseshoe crabs (Limulus polyphemus). Procuring blood for LAL testing involves capturing and bleeding over 500,000 crabs from wild marine populations each year. Whilst efforts are made by manufacturers to return crabs to the sea following the collection of blood, there is a level of mortality and sub-lethal impact involved, prompting increasing discussions about welfare and ethics. The 3Rs – the ambition to where possible, replace, reduce, and refine the use of animals – are established and accepted worldwide as the best framework for governing animal-dependent science. However, the biomedical utilization of horseshoe crabs to produce the LAL test has rarely been viewed through a 3Rs framework. More recently, there has been a renewed attention on sustainable methods and alternatives to the LAL test. Drawing on in-depth qualitative interviews, this article examines stakeholder perspectives on opportunities for thinking with the 3Rs, considering current appetites to replace, refine, and reduce contemporary biomedical reliance on horseshoe crabs. The shape of conversations about the biomedical utilization of horseshoe crabs has shifted significantly in recent years, and the 3Rs are an important driver of change, offering the potential to advance the use of more sustainable methods, and realize the welfare considerations increasingly expected across science and society.
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The limulus amebocyte lysate (LAL) assay remains the gold standard for endotoxin detection and must be validated for use with each product type and formulation.
“The limulus amebocyte lysate (LAL) assay remains the gold standard for endotoxin detection and must be validated for use with each product type and formulation (Gorman, 2020).”
From Isolator-based point-of-care manufacturing: a practical solution for GMP-compliant cell and extracellular vesicles therapy production (2025) · cites this paper as Gorman, 2020
The Introduction (page unavailable) calls LAL the primary method for endotoxin testing in North America and Europe, supporting its established role but not an unqualified global ‘gold standard’ designation. The section on replacing biomedical horseshoe crab use discusses validation requirements for the alternative rFC test, not a requirement to validate LAL for each product type and formulation. (LLM, conf=0.86)
Experimental — accuracy not yet measuredLAL and TAL are cell extracts from the hemolymph of different horseshoe crab species, at least two of which are considered vulnerable or endangered by the IUCN Red List.
“LAL and TAL [57] are cell extracts from the hemolymph of different horseshoe crab species, at least two are already considered vulnerable [58] or even endangered [59] by the International Union for Conservation of Nature's Red List of Threatened Species, respectively.”
From A worldwide survey on the use of animal‐derived materials and reagents in scientific experimentation (2022) · cites this paper as [57]
The Introduction (page unavailable) says the LAL test uses the blood of Atlantic horseshoe crabs, supporting the LAL portion of the claim. Our copy does not identify TAL or say that LAL and TAL come from different species. The vulnerable and endangered classifications are attached to separate citations [58] and [59] in the citing sentence, not to this source [57]. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThe European Pharmacopoeia included a synthetic substitute (recombinant Factor C, rFC) in 2016 and a method containing reagents deriving from human blood (Monocyte-Activation Test, MAT) in 2010.
“However, the European Pharmacopoeia included a synthetic substitute (recombinant Factor C, rFC) in 2016 [57] and a method containing reagents deriving from human blood (Monocyte‐Activation Test, MAT) in 2010 [60].”
From A worldwide survey on the use of animal‐derived materials and reagents in scientific experimentation (2022) · cites this paper as [57]
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References 41 · Cited by 37
Research works printed but not linked: 37
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- Authors
- Gorman, R.
- Affiliations
- University of Exeter (GB)
- Corresponding author
- Gorman, Richard
- ORCID
- Gorman, Richard
- Venue
- Frontiers in Marine Science
- Publisher
- Frontiers Media SA
- Published
- 2020-09-30
- Volume
- 7
- ISSN
- 2296-7745 (ISSN-L)
- PMC
- PMC7612741
- OpenAlex
- W3091624901
- Cited by
- 37
- References
- 41
- Citations by year
- 2026: 9 · 2025: 6 · 2024: 9 · 2023: 6 · 2022: 5 · 2021: 2
- FWCI
- 3.11
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Frontiers in Marine Science (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Figshare (submittedVersion, cc-by)
- Funders
- Wellcome Trust (218323/Z/19/Z, 205393/Z/16/Z)
- Topics
- Health Sciences › Veterinary › Small Animals › Animal testing and alternatives
- Physical Sciences › Environmental Science › Ecology › Crustacean biology and ecology
- Health Sciences › Veterinary › Small Animals › Animal Behavior and Welfare Studies
- Keywords
- Limulus polyphemus, endotoxin testing, Limulus amoebocyte lysate test, animal welfare, 3Rs, alternatives to animal testing, pharmaceutical quality control, animal ethics, stakeholder perspectives, sublethal effects
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