Adhere to a consistent method for storing cells to ensure the quality, viability and purity of AllCells products. By following this in-depth, step-by-step protocol for thawing cells, AllCells clients can expect repeatable results. Additional precautions and safety advisories are also highlighted.

General Instructions

  1. Recommended thawing media for diluting and washing cells are RPMI 1640, IMDM, or DMEM supplemented with 10% heat inactivated FBS warmed to room temperature (20-25°C).
  2. Proper aseptic technique should be used when handling and manipulating cells.
  3. Cryopreserved products should be counted immediately after thawing before any further manipulation. AllCells is not liable for any cell loss during subsequent processing or manipulation.

    Thawing Instructions

  4. Place thawing media in a 37°C water bath, spray with 70% ethanol and place in the BioSafety Cabinet.
  5. Remove cryobag from storage and place it in a 37°C water bath immediately. Make sure the bag is completely submerged and stable with no movement. During the thaw, you may check the status by gently inverting the bag and placing back into the water bath.
  6. When the majority (approximately 90%) of the contents are thawed, place the bag on the benchtop at room temperature to complete thaw.
  7. Spray or wipe the bag with 70% ethanol and transfer to the BioSafety Cabinet for further manipulation. You may ensure proper suspension by gently inverting the bag two times.
  8. Using the port, gently empty the contents of the bag into a sterile 100ml conical tube. You can add an additional 5-10 ml of thawing media to the empty bag to rinse it off into the tube.
  9. Slowly add thawing media to the tube containing the cells up to 4 times the volume of the cell suspension. Securely cap the tube and gently invert 3-5 times after adding all the media. Remove a sample to assess cell count and viability.
  10. Centrifuge the tube at 300g for 20 minutes at 4°C (no brake). Make sure there is a cell pellet at the bottom of the tube at the end of the run.
  11. Aspirate the supernatant slowly to avoid dislodging the cell pellet. Discard the supernatant.
  12. Resuspend the cell pellet* by slowly adding in the appropriate cell media to the desired volume to establish the needed cell concentration. Confirm cell count and viability.

*Make sure the cell pellet is properly dislodged and mixed. You may flick the cell pellet prior to adding the media.


Health Hazards of Liquid Nitrogen

Liquid nitrogen has a 700x expansion ratio, which may cause physical hazards and injuries from the explosion of cryovials, containers, equipment, or other devices. Extensive tissue damage or burns can result from exposure to LN2 or cold nitrogen vapors. Asphyxiation may result from the displacement of oxygen in the air with nitrogen to levels where there is insufficient oxygen. Inhalation of oxygen deficient air can cause dizziness, nausea, vomiting, loss of consciousness, and death.

Personal Protective Equipment

The following personal protective equipment is encouraged when handling or using LN2:

Cryo gloves/Waterproof thermal insulated gloves

  • Hands should be protected with waterproof thermal insulated gloves that can be quickly removed if LN2 is spilled on them. Cryo gloves are not intended for submerging hands into LN2.

Lab coats

  • Body must be protected with pants, lab coats, and closed-toe shoes.

Safety goggles

  • Eyes are sensitive to the extreme cold of LN2 and its vapors. Over-pressurization may result in the explosion of improperly stored cryovials. Chemical splash goggles should be used when handling LN2 and when handling cryovials and other sealed containers that have been stored in LN2.

Safety Precautions

AllCells uses cryovials that are designed for vapor phase liquid nitrogen storage.

If long-term storage in the LN2 liquid phase is required, do not use the cryovials provided by AllCells.

Use either:

  • Manufacturer-approved cryovials, specifically designed for liquid phase storage.
  • Gaseous phase-approved screw-top cryovials that are then hermetically sealed in an outer protective envelope designed for use in LN2.

The handling of cryovials inside of Biological Safety Cabinets or Chemical Hoods (with the sash lowered) will further reduce the risk of injury from explosions caused by excess pressure within the vial.

Limited Warranty: AllCells warranty of frozen cell products for a period of 1 year form the date of receipt if stored properly.


Cryovial: Simport T310 Cryovial®

For more information regarding cryovials, please visit Simport

For more information on AllCells products, please contact an AllCells Customer Success Manager at


The products purchased from AllCells are “For Research Use Only.” In compliance with U.S. Food and Drug Administration (FDA) Regulations, these products are not intended for use in clinical diagnostic procedures nor in therapeutic procedures.

These products must be:

  • Treated as potentially contaminated biological specimens even if available serological reports are negative.
  • Handled by establishing or following appropriate safety control procedures to ensure the safety of using these products.

A Certificate of Analysis

The Certificate of Analysis lists the following:

  • Product description
  • Item name
  • Lot number
  • Date of collection
  • Donor information (as provided)
  • Viral results (HIV, HBV, HCV)

If applicable:

  • Volume
  • Cell count
  • Cell concentration
  • Cell viability
  • Cell purity

Microbial growth (for cryo products only)

In addition, each purified cell product package contains Flow Cytometric Analysis

The figure below is a sample Flow Cytometric Analysis of our CD34+ enriched stem and progenitor cells from human mobilized peripheral blood. The upper left panel shows the leukocyte gating that removes the RBCs and debris from the purity analysis. The upper right panel shows the purity of cells as well as the isotype control reagent used to determine the background level of staining to set the positive gate. The bottom table displays the percent purity of the analyzed sample. Samples were analyzed on a BD FACSCantoTM or Beckman Coulter CytoFlexTM.