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Sperm Processing Media FAQ

Q. What is the density and density gradient of ISolate and ISolate Stock Solution?

A. Here are the density and density gradients of ISolate.

Product Catalog # Kit Components Density (g/mL) Density Gradient (%)
ISolate Kit 99264 99257 (Upper Layer – 50%) 1.06 50%
99258 (Lower Layer – 90%) 1.11 90%
ISolate Stock Solution (90%) 99275 N/A 1.11 90%

Q. How should I prepare a 40% upper layer of ISolate from 50% ISolate Upper Layer?

A. To obtain a 40% upper layer from our 50% ISolate Upper Layer, mix 8.0 mL of (upper layer) with 2.0 mL of Modified HTF Medium with Gentamicin - HEPES.

Q. How should I prepare an 80% lower layer of ISolate from 90% ISolate Lower Layer?

A. To obtain an 80% lower layer from our 90% ISolate Lower Layer, mix 8.9 mL of lower layer with 1.1 mL of Modified HTF Medium with Gentamicin - HEPES.

Q. Once ISolate gradient is prepared, how long can I leave it in the incubator prior to use?

A. We recommend using prepared ISolate gradient within two hours of preparation to avoid the mixing of the gradient prior to use.

Q. What are the diameter of cells that can pass through ISolate and the diameter of cells that cannot pass through ISolate?

A. ISolate uses a density gradient centrifugation technique as the method of separation. The gradients increase in density from the top to the bottom of the preparation, the sample is gently placed on top of the preparation, and centrifuged. During the process highly motile sperm cells actively move in the direction of the sedimentation gradient. This is in contrast to poorly motile/ immotile sperm cells that do not penetrate the boundaries of the gradient. Upon completion of the centrifugation highly motile sperm cells are enriched in a pellet at the bottom of the preparation1.

Q. Why does FUJIFILM Irvine Scientific provide sperm washing media without antibiotics when most other companies provide sperm washing media with antibiotics?

A. The addition of antibiotics to sperm washing media is at the discretion of the end user. Please reference your own clinic’s protocols when adding antibiotics. For additional details, each laboratory should consult its own laboratory procedures and protocols which have been specifically developed and optimized for your individual medical program. Please reference table below for a complete list of sperm processing products and gentamicin content.

Product Catalog # Gentamicin (Yes/No)
Sperm Washing Medium 9983 No
Freezing Medium - TYB with Glycerol & Gentamicin 90128 Yes
Refrigeration Medium - TYB with Gentamicin 90129 Yes
Multipurpose Handling Medium (MHM) with Gentamicin 90163 Yes
Multipurpose Handling Medium-Complete (MHM-C) with Gentamicin and HSA 90166 Yes
ISolate Kit 99264 No
ISolate Stock Solution 99275 No

Q. How do you thaw semen or sperm frozen in Freezing Medium - TYB with Glycerol & Gentamicin?

A. FUJIFILM Irvine Scientific recommends the following protocol for thawing raw semen and processed sperm.

Q. Can ISolate or ISolate Stock Solution be diluted?

A. Yes, ISolate can be diluted with Sperm Washing Medium, or with Modified HTF Medium with Gentamicin - HEPES.

Q. What are the differences between your sperm preservation media?

A. This table details the cryoprotectant, intended use, and use ratio of our sperm preparation media.

Product Catalog # Cryoprotectant Product Features Use Ratio
Freezing Medium - TYB with Glycerol & Gentamicin 90128 20% v/v egg yolk For cryopreservation of human semen 1 to 1
12% v/v glycerol
Refrigeration Medium - TYB with Gentamicin 90129 20% v/v egg yolk For refrigeration of human sperm up to 96 hours 1 to 1
Short term storage/capacitation at room temp
Arctic Sperm Cryopreservation Medium 90170 28% v/v glycerol For cryopreservation and storage of human sperm 3 to 1

Capacitation at room temperature for approximately two hours.

Q. What are the storage recommendations for UNOPENED sperm cryopreservation media?

A. These are the storage instructions for UNOPENED items.

Product Catalog # Packaging Size Storage Instructions (unopened product)
Freezing Medium - TYB with Glycerol & Gentamicin 90128 20 x 5 mL Below -10°C
100 mL
Refrigeration Medium - TYB with Gentamicin 90129 20 x 5 mL Below -10°C
Arctic Sperm Cryopreservation Medium 90170 12 x 5 mL 2-8°C

Q. What is the shelf life for OPENED sperm cryopreservation media?

A. Here is the shelf life for OPENED items.

Product Catalog # Open Vial Stability Can product be aliquoted?*
Freezing Medium - TYB with Glycerol & Gentamicin 90128 N/A (single use only) Yes
Refrigeration Medium - TYB with Gentamicin 90129 N/A (single use only) Yes
Arctic Sperm Cryopreservation Medium 90170 7 days No

*If smaller aliquots are desired, the end user may thaw the product and using aseptic technique aliquot into sterile labeled containers and freeze until time of use. Aliquots should be single use and product should not be exposed to repeated freeze thaw cycles.

Q. Can I freeze sperm with Refrigeration Medium - TYB with Gentamicin?

A. No, Refrigeration Medium - TYB is intended for short term refrigerated sperm storage. Refrigeration Medium- TYB is typically used to store sperm for up to 96 hours between 2-8°C, transporting semen, and as an aid in sperm capacitation for conventional fertilization.

For freezing sperm we recommend using Freezing Medium - TYB with Glycerol & Gentamicin or Arctic Sperm Cryopreservation Medium.

Q. How long can I use Freezing Medium - TYB with Glycerol & Gentamicin and Refrigeration Medium - TYB with Gentamicin after they are thawed?

A. Both products are intended to be single use and we recommend discarding any excess medium that remains after the procedures are completed. To optimize usage of your product, we recommend thawing the bottle/vial and aseptically aliquoting the media into smaller sterile bottles/vials and stored as directed on the product insert. Do not use aliquots that show a shift in color, particulate matter or any evidence of contamination.

Q. How is Arctic Sperm Cryopreservation Medium different from Freezing Medium - TYB with Glycerol & Gentamicin?

A. This product is for customers who prefer to freeze sperm without the use of test yolk buffer for long term storage. The product should be used in a ratio of 3:1 (sperm:Arctic).

Q. What is the approximate recovery rate of motile spermatozoa after freeze/thaw using sperm cryopreservation Freezing Medium - TYB with Glycerol & Gentamicin?

A. In general, the recovery rate is around 50% post-thaw when using Freezing Medium - TYB with Glycerol & Gentamicin.

  Fresh Post-Thaw
Raw Semen Freezing Medium TYB Commercial Medium, Glycerol Only
Healthy semen (n=25) Normal morphology (%) 26.3 ± 7.5 22.2 ± 6.4 19.4 ± 6.5
Condense chromatin (%) 92.4 ± 8.5 88.7 ± 11.2 85.2 ± 12.5
Motility (%) 52.8 ± 27.3 32.7 ± 19.1 29.1 ± 17.1
Poor quality semen (n=35) Normal morphology (%) 11.7 ± 6.1 9.3 ± 5.6 7.8 ± 4.2
Condense chromatin (%) 78.9 ± 10.3 70.7 ± 10.8 64.6 ± 13.0
Motility (%) 28.3 ± 22.5 13.3 ± 9.9 10.7 ± 7.5

Q. Is it acceptable to put TYB in the uterus at insemination? Should TYB be washed prior to IUI?

A. We recommend that the TYB freezing medium should be removed prior to IUI either by simple washing with Sperm Washing Medium or Multipurpose Handling Medium - Complete, or if washing thawed raw semen, by density gradient centrifugation with ISolate2,3,4.

Q. Sperm were frozen using another vendor's kit and protocol. Can they be thawed using FUJIFILM Irvine Scientific reagents and protocols?

A. FUJIFILM Irvine Scientific has not performed studies to confirm this usage and does not recommend the combined usage of its reagents with those from other vendors. However, independent recent studies report usage of MHM-C with other vitrification reagents and protocols5.

Q. Is the dual-buffered Multipurpose Handling Medium - Complete better for handling sperm than single buffered media?

A. A study by Bormann and Curchoe demonstrated the superior performance of dual-buffer solution of HEPES and MOPS containing Multipurpose Handling Medium - Complete (MHM-C) for key sperm parameters over single buffer controls6.

Q. Can oocytes or embryos be vitrified using Arctic Sperm Cryopreservation Medium?

A. Components of cryopreservation media are different for sperms and oocytes/embryos. FUJIFILM Irvine Scientific offers specific media for this application. Please consider Vit Kit-Freeze and Vit Kit-Thaw for oocytes and embryos.



  1. Henkel, R. R., & Schill, W. B. (2003). Sperm preparation for ART. Reprod Biol Endocrinol. Nov;14;1:108.
  2. Hammadeh, M.E., Greiner, P., Rosenbaum, P., Schmidt, W. (2001). Comparison Between Human Sperm Preservation Medium and TEST-Yolk Buffer on Protecting Chromatin and Morphology Integrity of Human Spermatozoa in Fertile and Subfertile Men After Freeze-Thawing Procedure. J Androl. Nov-Dec;22(6):1012-8.
  3. Wolf, D. P., Patton, P. E., Burry, K. A., & Kaplan, P. F. (2001). Intrauterine insemination–ready versus conventional semen cryopreservation for donor insemination: a comparison of retrospective results and a prospective, randomized trial. Fertil Steril. Jul;76(1):181-5.
  4. Larson, J. M., McKinney, K. A., Mixon, B. A., Burry, K. A., & Wolf, D. P. (1997). An intrauterine insemination-ready cryopreservation method compared with sperm recovery after conventional freezing and post-thaw processing*. Fertil Steril. July; 68(1), 143–148.
  5. Medranoa L., Encisob M., Gomez-Torresc M.J., Aizpuruaa J. (2019). First birth of a healthy infant following intra-cytoplasmic sperm injection using a new permeable cryoprotectant-free sperm vitrification protocol. Cryobiology, 2019 Apr;87:117-119.
  6. Optimization of sperm culture conditions for human ART. Charles L. Bormann and Carol L. Curchoe.
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