CoA components that matter vs don’t for cell therapy starting materials
The mandatory core
Donor identifiers and eligibility
A CoA should link to a donor ID that the supplier can trace back to an eligibility record. That eligibility record, under 21 CFR 1271 in the US, must cover donor screening, testing for relevant communicable diseases, and documented consent. The CoA itself does not need to include the full record, but it should reference the donor ID so a regulator or an auditor can ask for it.
Essential. Without this, the CoA cannot be used in a CMC submission.
Collection date and time
Fresh leukopak biology is time-sensitive. A CoA that shows a collection timestamp allows the receiving lab to calculate total transit time and correlate any observed variance with time-on-clock.
Essential.
Cell count and volume
Total nucleated cell count, white blood cell count, total volume, and nucleated cells per mL are the baseline quantitative measures. These fields should be method-documented (e.g., hematology analyzer model).
Essential.
Viability
Viability by a documented method (7-AAD, trypan blue, acridine orange / propidium iodide) with acceptance criteria. For cryopreserved products, viability should be post-thaw.
Essential.
Microbiology and endotoxin
Sterility results (or bioburden for non-sterile tiers), endotoxin, and mycoplasma as applicable to the product tier. Methods and acceptance criteria should be documented.
Essential.
The high-value specifics
Immunophenotyping
A flow cytometry panel showing at minimum CD3, CD4, CD8, CD14, CD16, CD19, and CD56 for a general PBMC/leukopak product. This tells the receiving lab what the cellular composition is before the assay starts. A CoA without immunophenotype data is a CoA that requires the receiving lab to run its own flow panel on every arriving lot.
Essential for most cell therapy applications.
T cell programs benefit from CD3/CD4/CD8 subpopulations plus memory markers (CD45RA, CD45RO, CCR7).
NK programs benefit from CD56bright/dim and NKG2A/NKG2C staining.
Monocyte programs benefit from classical/intermediate/non-classical breakdown (CD14/CD16).
B cell programs benefit from CD19, CD20, and naïve/memory/plasmablast markers.
HLA typing
High-resolution (4-digit minimum) typing across HLA-A, -B, -C, -DRB1, -DQB1, -DPB1, with method and accreditation documented. See the separate article on HLA resolution for which applications need which panel.
Essential for most clinical-path programs.
CBC on donor and product
Complete blood count on the donor at pre-collection and on the final product bag. This lets the receiving lab understand both the donor’s baseline and what the collection actually delivered. Many CoAs have one or the other; the useful version has both.
Essential for reproducibility across lots.
Cryopreservation details (for frozen products)
Freeze medium (e.g., CS10, 90% FBS + 10% DMSO), controlled-rate freeze profile, and storage temperature. Post-thaw viability with a documented thaw protocol.
Essential for frozen products.
The nice-to-haves
Blood type (ABO/Rh)
Useful for some transplant modeling applications and for donor matching across lots, not essential for most TCR or CAR engineering work.
Context-dependent.
Infectious disease panel beyond the required
Some suppliers expand the infectious disease panel beyond the regulatory minimum. This is occasionally useful for specific geographies or immune-compromised downstream applications, but is not a general-purpose CoA field.
Context-dependent.
Donor demographics
Age, sex, ethnicity, smoking status. Useful for stratified analyses and for matching donors across lots. Some programs need it, some do not.
Context-dependent.
The filler fields
Brand statements and marketing text
Phrases like “premium quality” or “industry-leading viability” on a CoA are not CoA content. They are marketing. A CoA is a record, not a sales document.
Unnecessary.
Stock photos of the collection facility
Images on a CoA do not add regulatory or scientific value. They make the document harder to audit electronically and add nothing for the receiving QC team.
Unnecessary.
Generic equipment lists
Listing every instrument in the lab, without tying specific instruments to specific measurements on this CoA, is space filler. The useful version ties each measurement to the method and the instrument used.
Unnecessary in general list form.
The “missing fields that predict a re-characterization day”
| Missing field | What happens on arrival |
|---|---|
| No immunophenotyping panel | Receiving lab runs a flow panel before assay start. Recurring cost. |
| No HLA typing or low-resolution only | Re-typing required for TCR/pMHC/allogeneic work. |
| No collection timestamp | Cannot correlate variance with transit time. Troubleshooting is slower. |
| Viability only (no cell subset data) | Lot-to-lot composition unknown until the receiving lab generates it. |
| No CBC on donor | Donor baseline unknown. Cross-lot comparisons are weaker. |
| No method documentation | Reviewer questions in CMC. Supplier audit triggered. |
A useful mental model
A CoA is a document that a regulator, an auditor, or a process development scientist will read under time pressure. The useful CoA is one that answers the questions those readers will ask without requiring a follow-up email to the supplier. Everything that does not answer one of those questions is either filler or, worse, is hiding the absence of an answer.
Where OrganaBio fits
Our standard CoA for leukopaks and PBMCs includes: donor ID and eligibility reference, collection timestamp, cell counts and volumes, viability (pre- or post-thaw as applicable), sterility and endotoxin, 8-color immunophenotyping, high-resolution HLA typing on six genes, and CBC data on both the donor at pre-collection and the final product bag. Method and instrument are documented per measurement. Cryopreservation details are included for frozen products.
Compare against your current CoA
Request a recent OrganaBio CoA. Lay it next to the one in your program today and see which fields match your assay requirements.
Part of the buyer-journey series. Related: Current inventory · GMP manufacturing · CDMO services