2003
DOI: 10.1590/s0041-87812003000500003
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Abstract: The sperm tail flexibility test (STFT) is an easy and cost-effective way for selecting viable immotile spermatozoa and can be used as an alternative method for determining the viability of spermatozoa. This test seems to be a simple and risk-free method when compared to the swelling test.

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Cited by 35 publications
(10 citation statements)
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References 13 publications
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“…Cryopreserved specimens are thawed and processed using the principles already described (30). Methods for selecting viable sperm for ICSI are currently available in cases immotile spermatozoa only are obtained after processing (27,31).…”
Section: Laboratory Processing Of Surgi-cally-retrieved Spermmentioning
confidence: 99%
“…Sperm tail flexibility is considered a marker of sperm viability. [3031] If the tail remains rigid upon touching and sperm head and tail move together as a block, spermatozoon is then considered non-viable for ICSI.…”
Section: Introductionmentioning
confidence: 99%
“…Immotile testicular spermatozoa when gently agitated with an ICSI needle show a flexible tail as sign of vitality (Soares et al, 2003;de Oliveira et al, 2004). ICSI with these spermatozoa resulted in equal fertilisaton (FR) and pregnancy rates (PR) in comparison to motile testicular spermatozoa.…”
Section: Introductionmentioning
confidence: 99%
“…Based on vitality estimation, spermatozoa are randomly chosen for injection. This approach leads to variable fertilisation rates (Papadimas et al ., ; von Zumbusch et al ., ; Ceccaldi et al ., ), (iii) the hypo‐osmotic swelling test (HOST) is a nondamaging technique based on intact sperm membrane semipermeability, which causes sperm swelling under hypo‐osmotic conditions, when an influx of water results in cell volume expansion (Liu et al ., ; Cayan et al ., ; Peeraer et al ., ), (iv) the use of a laser was also proposed to select viable spermatozoa (Gerber et al ., ; Nordhoff et al ., ), (v) sperm tail flexibility test (STFT) that consists in the selection and injection of spermatozoa showing flexible tails when touched with the ICSI pipette was also used to manage akitenospermia cases (Soares et al ., ; Oliveira et al ., ).…”
Section: Introductionmentioning
confidence: 99%
“…During ICSI, the proper selection of immotile viable spermatozoa and setting them apart from immotile nonviable spermatozoa poses a challenge to embryologists. Some techniques have been developed to resolve the dilemma, including the hypo‐osmotic swelling test (HOST; Stanger, Vo, Yovich, & Almahbobi, ; Tubman, Check, Bollendorf, & Wilson, ), sperm tail flexibility test (STFT; Nordhoff, ; Soares et al., ) laser‐assisted immotile sperm selection (LAISS; Gerber, Kruse, Hirchenhain, Krussel, & Neumann, ), birefringence‐polarisation microscopy (Collodel, Federico, Pascarelli, Geminiani, & Moretti, ; Ghosh et al., ), and chemical stimulation (Ebner et al., ; Terriou et al., ).…”
Section: Introductionmentioning
confidence: 99%