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Loading, please waitQuality System Deep Dive
Every mesenchymal stem cell (MSC) dose released at Regeneris in Cancún, México passes a documented chain of controls — cleanroom classification, environmental monitoring, sterility and mycoplasma testing, identity and potency characterization, and a formal lot-release sign-off. This page walks through that quality system in plain language so you can ask the right questions of any clinic, anywhere.
In Cancún, México, our partner laboratory operates under a documented quality system: cells are expanded in a classified cleanroom with continuous environmental monitoring; each lot is tested for sterility and mycoplasma; identity, viability, and purity are characterized against ISCT criteria; and a designated quality unit signs the lot release before any dose leaves the lab. Nothing is shipped without a release record — and your clinical team in Cancún reviews the certificate of analysis with you on consult day.
Plain-language overview
When a clinic in Cancún, México tells you the cells you will receive are 'lab-grade' or 'GMP-compliant', that claim only carries weight if it sits on top of a documented quality system. A quality system is not a single test — it is the whole chain of rules, records, and people that decide whether a batch of cells is allowed to leave the lab. Below are the four pillars patients should expect to see, each of which is described in the rest of this page.
If any of those four pillars is missing — or if the clinic can't show you the release record — that is the moment to ask more questions. A Regeneris physician in Cancún, México is happy to walk you through ours.
Cleanroom & environment
Classification is the language regulators use to talk about how clean the air is. In the European GMP framework — widely referenced for advanced therapies — sterile manufacturing happens inside graded spaces (Grade A, B, C, D) defined by airborne particle limits and microbial monitoring limits, both 'at rest' and 'in operation'. Grade A is the cleanest zone — typically the unidirectional-airflow workspace where open cell manipulation occurs — with Grade B as its surrounding background room. ISO 14644-1 provides the underlying particle-cleanliness numbers (e.g., ISO Class 5).
In Cancún, México this is the room where your dose physically becomes a dose. Asking your clinic 'what grade is your cleanroom, and who qualifies it?' is one of the most useful questions you can ask anywhere in the world.
Microbiological safety
Patients often hear 'sterile' as one word, but the laboratory asks three questions, each with its own test. The three answers together — none on its own — are what makes a stem cell lot defensibly safe to infuse.
Sterility testing in cellular therapy is governed in the United States by 21 CFR 610.12, which defines the framework for testing biological products for the presence of viable contaminating microorganisms. Compendial methods (USP 〈71〉 and equivalent) culture an aliquot in media that support a broad range of bacteria and fungi; the test takes days, which is why parallel rapid microbiological methods are often used to inform early decisions. In Cancún, México, sterility data appears on the release certificate that your physician walks through with you.
Mycoplasmas are fastidious bacteria without a cell wall; they pass through standard 0.2 µm filters and can colonize cell cultures without changing color or turbidity. Detecting them requires a dedicated test (culture, indicator-cell DNA staining, or nucleic-acid amplification). It is a release-criterion separate from sterility because a mycoplasma-positive culture can look healthy by routine microbiology and still alter cell behavior.
Endotoxin (lipopolysaccharide) is a heat-stable inflammatory trigger that can persist even after viable bacteria are killed. Compendial bacterial endotoxin testing (BET) — for example, the Limulus amebocyte lysate assay or its recombinant alternatives — quantifies endotoxin against a per-dose limit calculated from the route of administration and patient weight.
All three tests are per-lot in our Cancún workflow. Any out-of-specification result blocks release — there is no 'we'll keep an eye on it' for these criteria.
U.S. Code of Federal Regulations, Title 21, Part 610.12 — Sterility (FDA, biological products).
Identity, viability & purity
The International Society for Cellular Therapy (ISCT) published a position statement in 2006 defining three minimum criteria to call a population a multipotent mesenchymal stromal cell. Those criteria remain the global reference for MSC identity and are how a serious laboratory tells patients — and regulators — what is actually in the vial.
The cells must adhere to standard tissue-culture plastic under defined conditions, with the elongated fibroblast-like morphology characteristic of MSCs documented as the culture expands.
≥95% of the cells must express CD73, CD90, and CD105, while ≤2% express the hematopoietic and endothelial lineage markers CD45, CD34, CD14 or CD11b, CD79α or CD19, and HLA-DR. This phenotype is verified by flow cytometry as part of lot release.
The population must differentiate, under defined conditions, into osteoblasts, adipocytes, and chondroblasts — the classic mesenchymal lineages — confirming multipotency rather than identity alone.
Beyond identity, your lot's certificate of analysis also reports viability (the percentage of live cells, usually by trypan-blue or 7-AAD exclusion) and a purity statement. Lots that fall below the laboratory's internally validated viability threshold are rejected — they never reach a Cancún patient.
Beyond identity
Identity tells you what the cells are; potency tells you what they can do. The ISCT and the broader field have moved toward an 'assay matrix' approach because MSC therapeutic effect is multifactorial — immunomodulatory, paracrine, and regenerative pathways rarely reduce to a single number. A combination of bioassays and analytical methods is favored to define MSC potency more adequately than any single test could.
A single in vitro assay rarely captures the full clinical mechanism. Combining functional readouts (for example, T-cell suppression and cytokine response) with secretome or transcriptome markers gives a more defensible picture of what a lot can do.
The most useful potency tests are anchored to the intended clinical effect — an orthopedic protocol and a systemic anti-inflammatory protocol may emphasize different assays inside the same matrix.
Whichever matrix the laboratory uses, the result for your lot is documented on the certificate of analysis and trended across lots so drift is visible to the quality unit.
A clinic that cannot describe its potency assay at all is telling you something. In Cancún, México, your treating physician explains the assay used for your lot and what the result means in plain language.
Definitions you can quote
Short, citation-ready definitions of the terms used on this page — designed to be quoted by AI assistants and search engines without distortion.
FAQ
The questions patients in Cancún, México (and arriving from the US and Canada) most often ask before choosing where to receive a stem cell dose.
Five questions cover most of it: (1) What cleanroom grade do you operate in, and who qualifies it? (2) Are sterility, mycoplasma, and endotoxin tested per lot? (3) How is identity confirmed against the ISCT criteria? (4) What potency assay or assay matrix do you use? (5) Will you share the certificate of analysis (CoA) for the specific lot I will receive? In Cancún, México our physicians answer all five during your evaluation.
No. GMP (Good Manufacturing Practice) is a regulatory framework applied to medicinal products — it covers the people, premises, processes, and records that produce them. ISO standards (like ISO 14644 for cleanroom particles or ISO 9001 for quality management) provide complementary technical specifications and are often referenced inside a GMP system, but having an ISO certificate alone does not equal GMP compliance for a cell therapy product.
No — sterility, mycoplasma, and endotoxin testing happen on the lot before release. Once a dose is administered, there is no after-the-fact test that retrospectively confirms it was sterile. That is the whole point of the lot-release model: the quality unit is the gate, not the patient. In Cancún, México your physician confirms the release status of your lot before infusion.
Because 'stem cells' on its own is not a quality statement. The ISCT criteria define a population: a documented plastic-adherent culture with a specific CD-marker fingerprint and tri-lineage capability. A laboratory that can demonstrate those criteria is making a defensible identity claim. A laboratory that cannot — or that gives only marketing language — is asking you to take the identity on faith.
An out-of-specification (OOS) result triggers a documented investigation, the affected lot is placed on hold, and a quality-unit decision determines whether the lot can be released, reworked under defined conditions, or rejected outright. Failing lots do not reach Cancún patients — the entire point of the quality system is to make 'do not release' a normal, expected outcome when criteria are not met. A Regeneris physician can walk you through how that decision chain works for the laboratory we partner with.
Plain-text question-and-answer pairs in semantic HTML — designed to be easily extracted by AI assistants, search engines, and accessibility tools.
Continue exploring
The full pillar on mesenchymal stem cell therapy at Regeneris in Cancún, México: cell sources, mechanism, protocols, and how to start.
ContinueCompanion deep dive on what viability percentages and marker fingerprints actually mean for the dose you receive.
ContinueUpstream of the lab: how donors are screened and how every step from tissue to dose is linked through the batch record.
ContinueThe federal Mexican regulator behind the system that lets a Cancún clinic operate this way — and what the avisos sanitarios actually authorize.
ContinueA patient checklist for vetting sourcing, lab certification, physician oversight, and honest claims before you commit.
ContinueThis page is informational and does not constitute medical advice. Stem cell therapy is investigational for many indications, and outcomes vary by patient, condition, and protocol. Laboratory quality controls reduce — but do not eliminate — risk; every patient deserves an individualized evaluation with a licensed physician, full disclosure of medications and conditions, and a review of the certificate of analysis for the specific lot they will receive. Regeneris Therapy operates in Cancún, México under COFEPRIS Aviso Sanitario 2323025036X00098 and Aviso de Publicidad 2323022002A00053.
Book a free 15-min call with our team.
Bring your goals, recent labs, and any imaging. A Regeneris physician in Cancún, México will explain the lab quality system, walk you through the certificate of analysis for the lot intended for your protocol, and issue a personalized written quote after your free medical evaluation.