[
1. Efrat Z, Perri T, Ramati E, Tugendreich D, Meizner I. Fetal gender assignment by first-trimester ultrasound. Ultrasound Obstet Gynecol 2006;27(6):619-21.10.1002/uog.2674
]Search in Google Scholar
[
2. Chelli D, Methni A, Dimassi K, Boudaya F, Sfar E, Zouaoui B, et al. Fetal sex assignment by first trimester ultrasound: a Tunisian experience. Prenat Diagn 2009;29(12):1145-8.10.1002/pd.2374
]Search in Google Scholar
[
3. Lubusky M, Studnickova M, Skrivanek A, Vomackova K, Prochazka M. Ultra-sound evaluation of fetal gender at 12–14 weeks. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2012;156(4):324-9.10.5507/bp.2012.022
]Search in Google Scholar
[
4. Manzanares S, Benítez A, Naveiro-Fuentes M, López-Criado MS, Sánchez-Gila M. Accuracy of fetal sex determination on ultrasound examination in the first trimester of pregnancy. J Clin Ultrasound 2016;44(5):272-7.10.1002/jcu.22320
]Search in Google Scholar
[
5. Hsiao CH, Wang HC, Hsieh CF, Hsu JJ. Fetal gender screening by ultra-sound at 11 to 13(+6) weeks. Acta Obstet Gynecol Scand 2008;87(1):8-13.10.1080/00016340701571905
]Search in Google Scholar
[
6. Arfi A, Cohen J, Canlorbe G, Bendifallah S, Thomassin-Naggara I, Darai E, et al. First-trimester determination of fetal gender by ultrasound: measurement of the ano-genital distance. Eur J Obstet Gynecol Reprod Biol 2016;203:177-81.10.1016/j.ejogrb.2016.06.001
]Search in Google Scholar
[
7. Mielke G, Kiesel L, Backsch C, Erz W, Gonser M. Fetal sex determination by high resolution ultrasound in early pregnancy. Eur J Ultrasound 1998;7(2):109-14.10.1016/S0929-8266(98)00014-7
]Search in Google Scholar
[
8. Benoit B. Early fetal gender determination. Ultrasound Obstet Gynecol 1999;13(5):299-300.10.1046/j.1469-0705.1999.13050299.x10380290
]Search in Google Scholar
[
9. Whitlow BJ, Lazanakis MS, Economides DL. The sonographic identification of fetal gender from 11 to 14 weeks of gestation. Ultrasound Obstet Gynecol 1999;13(5):301-4.10.1046/j.1469-0705.1999.13050301.x10380291
]Search in Google Scholar
[
10. Mazza V, Contu G, Falcinelli C, Battafarano S, Cagnacci A, Vito G, et al. Bio-metrical threshold of biparietal diameter for certain fetal sex assignment by ultrasound. Ultrasound Obstet Gynecol 1999;13(5):308-11.10.1046/j.1469-0705.1999.13050308.x10380293
]Search in Google Scholar
[
11. Efrat Z, Akinfenwa OO, Nicolaides KH. First-trimester determination of fetal gender by ultrasound. Ultrasound Obstet Gynecol 1999;13(5):305-7.10.1046/j.1469-0705.1999.13050305.x10380292
]Search in Google Scholar
[
12. Pedreira DA. In search for the ‘third point’. Ultrasound Obstet Gynecol 2000;15(3):262-3.10.1046/j.1469-0705.2000.00034.x10846786
]Search in Google Scholar
[
13. Pedreira DA, Yamasaki A, Czeresnia CE. Fetal phallus ‘erection’ interfering with the sonographic determination of fetal gender in the first trimester. Ultrasound Obstet Gynecol 2001;18(4):402-4.10.1046/j.0960-7692.2001.00532.x11779004
]Search in Google Scholar
[
14. Mazza V, Falcinelli C, Percesepe A, Paganelli S, Volpe A, Forabosco A. Noninvasive first trimester fetal gender assignment in pregnancies at risk for X-linked recessive diseases. Prenat Diagn 2002;22(10):919-24.10.1002/pd.43412378578
]Search in Google Scholar
[
15. Chi C, Hyett JA, Finning KM, Lee CA, Kadir RA. Non-invasive first trimester determination of fetal gender: a new approach for prenatal diagnosis of haemophilia. BJOG 2006;113(2):239-42.10.1111/j.1471-0528.2006.00813.x16412004
]Search in Google Scholar
[
16. Hyett JA, Gardener G, Stojilkovic-Mikic T, Finning KM, Martin PG, Rodeck CH, et al. Reduction in diagnostic and therapeutic interventions by noninvasive determination of fetal sex in early pregnancy. Prenat Diagn 2005;25(12):1111-6.10.1002/pd.128416231296
]Search in Google Scholar
[
17. Mazza V, Di Monte I, Pati M, Contu G, Ottolenghi C, Forabosco A, et al. Sonographic biometrical range of external genitalia differentiation in the first trimester of pregnancy: analysis of 2593 cases. Prenat Diagn 2004;24(9):677-84.10.1002/pd.94515386456
]Search in Google Scholar
[
18. Bogers H, Rifouna MS, Koning AHJ, Husen-Ebbinge M, Go ATJI, van der Spek PJ, et al. Accuracy of fetal sex determination in the first trimester of pregnancy using 3D virtual reality ultrasound. J Clin Ultrasound 2018;46(4):241-6.10.1002/jcu.2255129048748
]Search in Google Scholar
[
19. Carlson BM. Human Embryology and Developmental Biology. Philadelphia: Mosby; 2004.
]Search in Google Scholar
[
20. Jauniaux E, Johns J, Burton GJ. The role of ultrasound imaging in diagnosing and investigating early pregnancy failure. Ultrasound Obstet Gynecol 2005;25(6):613-24.10.1002/uog.189215861413
]Search in Google Scholar
[
21. Oh JS, Wright G, Coulam CB. Gestational sac diameter in very early pregnancy as a predictor of fetal outcome. Ultrasound Obstet Gynecol 2002;20(3):267-9.10.1046/j.1469-0705.2002.00774.x12230450
]Search in Google Scholar
[
22. Robinson HP. ‘‘Gestation sac’’ volumes as determined by sonar in the first trimester of pregnancy. Br J Obstet Gynaecol 1975;82(2):100-7.10.1111/j.1471-0528.1975.tb02205.x
]Search in Google Scholar
[
23. Streeter GL. Contributions to Embryology. Vol. 143. Washington, DC: Carnegie Institution Publications; 1921. p. 10-1.
]Search in Google Scholar
[
24. Lo YM, Corbetta N, Chamberlain PF, Rai V, Sargent IL, Redman CW, et al. Presence of fetal DNA in maternal plasma and serum. Lancet 1997;350(9076):485-7.10.1016/S0140-6736(97)02174-0
]Search in Google Scholar
[
25. Borowski J, Bulsa M, Słabikowski A, Walaszczyk A, Borowska J. Ultra-sound evaluation of the sex of the fetus after the 7th week of pregnancy, Averroes. Eur Med J 2021;2(1):1-10.
]Search in Google Scholar
[
26. Speroff L, Fritz MA. Kliniczna endokrynologia ginekologiczna i niepłodność. Warszawa: MediPage; 2007.
]Search in Google Scholar