World Health Organization updated reference values for human semen characteristics
The WHO has published new reference guidelines for semen parameters. These were generated by evaluating 4,500 men in 14 countries whose partners had less than or equal to 12 months time to pregnancy (TTP). The WHO authors found that with a 95% confidence, men whose partners had TTP of 12 or fewer months had NO LESS than the following:
- Semen volume: 1.5 ml
- Total sperm in the ejaculate: 39 million
- Sperm per ml: 15 million/ml
- Vitality: 58% live
- Progressive motility: 32%
- Total Motility: 40%
- Morphologically Normal: 4%
(There was a typing error here on 12.15, the values are correct now).
This group of fathers had significantly better semen quality than semen samples tested in the general population. It is important to note that falling below these levels does not mean that a male factor is causing a couples infertility, but rather that male infertility is a possible factor in the couple’s failing to conceive.
It is IMPERATIVE that any clinic performing a semen analysis for a couple use WHO guidelines to evaluate and interpret the sample. There is NO excuse to not be performing up to date analysis methods on something this important.
Your physician can find the entire study at Human Reproduction Update Advance Access Nov 24,2009.
Blessings ~ Dr. E
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