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Related Experiment Video

Updated: Jan 25, 2026

Collection of Post-mating Semen from the Female Reproductive Tract and Measurement of Semen Liquefaction in Mice
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Post-ejaculatory increase in human semen osmolality in vitro.

Emma Holmes1, Lars Björndahl1, Ulrik Kvist1

  • 1ANOVA, Karolinska University Hospital and Karolinska Institutet, Stockholm, Sweden.

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|May 11, 2019
PubMed
Summary
This summary is machine-generated.

Human semen osmolality increases significantly after liquefaction, creating a variable in vitro environment for sperm. This osmolality shift during sperm preparation for assisted reproductive technology (ART) may impact treatment outcomes.

Keywords:
changes post-ejaculationhuman semen osmolality

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Area of Science:

  • Reproductive biology
  • Andrology
  • Biomedical engineering

Background:

  • Spermatozoa face unique challenges in vitro for assisted reproductive technology (ART) compared to in vivo conditions.
  • Extracellular osmolality fluctuations pose a potential threat to sperm survival and function.
  • Current knowledge regarding human semen osmolality and its post-ejaculatory changes remains inconsistent.

Purpose of the Study:

  • To investigate alterations in human semen osmolality following ejaculation and during sperm handling procedures for ART.
  • To quantify the variability of osmolality changes in semen samples prepared for in vitro use.

Main Methods:

  • Osmolality was measured in 86 human semen samples using the freezing-point depression method.
  • Measurements were taken at various time points and temperatures during in vitro storage.
  • The reliability of the freezing-point depression method for whole semen osmolality was validated.

Main Results:

  • At ejaculation, semen osmolality was found to be isotonic with cervical mucus and bodily fluids.
  • A significant increase in osmolality was observed after semen liquefaction, with considerable inter-sample variability.
  • Osmolality increased with rising temperatures, an effect mitigated by denaturing temperatures.
  • Spermatozoa encountered a highly variable osmolality environment during in vitro handling.

Conclusions:

  • Human semen undergoes a marked and variable increase in osmolality post-ejaculation and during in vitro handling.
  • These osmolality changes may represent a critical factor influencing sperm viability and function in ART.
  • Further research is warranted to understand the clinical implications of these in vitro osmolality shifts on ART success rates.