![]() The criteria for sperm morphology was developed less than a decade ago, so there are still a lot of discrepancies in how the test is conducted and results interpreted. IVF involves the collection of an egg and sperm sample to be combined in a petri dish in the hopes of fertilization. A score below 4 percent may mean it takes longer than normal to achieve pregnancy.Ī result of 0 percent NF usually means in vitro fertilization (IVF) may be necessary for conception. The precise range can vary, but typically a normal or healthy sperm morphology range is between 4 and 14 percent NF. Having a large number of abnormally formed sperm in a sample and a low NF score are signs of a condition called teratozoospermia. Share on Pinterest During a sperm morphology test, a sample of the sperm will be examined under a microscope. It typically takes three or more tests that produce the same or similar results to confirm qualities such as morphology, vitality, and mobility. Factors such as human error, contamination, mislabeling, and time before processing also make multiple tests necessary. There is a high level of variation between different people, as well as between samples from the same individual. One round of testing is not enough to fully assess semen or sperm quality. Sperm morphology tests can also be assessed using image analysis technology, such as a computer-aided sperm morphometric assessment (CASA).Īccording to the World Health Organization, computer based tests are more precise and reliable than manual tests because of the removed risk of human error. Technicians typically calculate the percentage of NF sperm out of 200 or more sperm in one segment of the sample. Lab technicians usually process sperm morphology tests by putting a small portion of the semen on a glass slide, letting it air dry, and then staining it with a dye that makes individual sperm easier to see under the microscope. an uncoiled, 45 μm-long tail that should be thinner than the sperm head and midpiece.midpiece of the sperm (the segment between the head and tail) should be about the same length as the head but much slimmer. ![]() ![]() a head free of large vacuoles (fluid filled organelles) and have no more than two small vacuoles that take up less than 20 percent of the total head.an acrosome (a membrane with enzymes capable of penetrating the egg’s membrane) tip that covers between 40 and 70 percent of the sperm head.a head that is between 2.5 to 3.5 micrometers (μm) wide and 5 to 6 μm long.Requirements for a normally formed sperm include: Sperm morphology tests examine semen samples under a microscope and calculate the percentage of sperm with a normal form (NF) in the total sample.
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