
Reference Manual 48
Gestational Sac (GS) : HANSMANN
GA Table
Hansmann M., Hackeloer BJ, Staudach A, Wittman. “Ultrasound Diagnosis in Obstetrics and
Gynecology.” Springer- Verlag, New York, 1986.
GS (cm) Age (wd) GS (cm) Age (wd)
0.70 04w6d 1.50 06w5d
0.90 05w5d 2.40 07w3d
1.00 06w0d 2.80 08w2d
1.30 06w2d 3.40 09w0d
Gestational Sac (GS) : HELLMAN
GA Table
Hellman LM, Kobayashi M, Fillisti l, et al. Growth and development of the human fetus prior to
the 20th week of gestation. American Journal of Obstetrics and Gynecology
GS (cm) Age (wd) GS (cm) Age (wd) GS (cm) Age (wd) GS (cm) Age (wd)
0.40 04w1d 1.90 06w2d 3.40 08w3d 4.90 10w4d
0.50 04w2d 2.00 06w3d 3.50 08w4d 5.00 10w5d
0.60 04w3d 2.10 06w4d 3.60 08w5d 5.10 11w0d
0.70 04w4d 2.20 06w5d 3.70 08w6d 5.20 11w1d
0.80 04w5d 2.30 06w6d 3.80 09w0d 5.30 11w2d
0.90 04w6d 2.40 07w0d 3.90 09w1d 5.40 11w3d
1.00 05w0d 2.50 07w1d 4.00 09w2d 5.50 11w4d
1.10 05w1d 2.60 07w2d 4.10 09w3d 5.60 11w5d
1.20 05w2d 2.70 07w3d 4.20 09w4d 5.70 11w6d
GS (cm) Age (wd) GS (cm) Age (wd) GS (cm) Age (wd) GS (cm) Age (wd)
1.30 05w3d 2.80 07w4d 4.30 09w5d 5.80 11w6d
1.40 05w4d 2.90 07w5d 4.40 09w6d 5.90 12w0d
1.50 05w5d 3.00 07w6d 4.50 10w0d 6.00 12w1d
1.60 05w6d 3.10 08w0d 4.60 10w1d
1.70 06w0d 3.20 08w1d 4.70 10w2d
1.80 06w1d 3.30 08w2d 4.80 10w3d
Gestational Sac (GS) : NYBERG
GA Table
Nyberg, David, A., Hill, Lyndon, M., Bohm-Vele, Marcela., Mendelson, Ellen, B. “Transvaginal
Ultrasound.” Mosby Yearbook, 76. 1992
GA = 0.132 × GS
mm
+ 4.299
Output Unit : w(weeks)
Input Unit : mm
Min Range : 0.14 cm
Max Range : 5.54 cm
Gestational Sac (GS) : TOKYO
GA Table
Tokyo University Takashi Okai, et al. Japan Society of Obstetrics and Gynecology, Vol.38, No.8
GS (cm) GA (wd) ±SD (wd) GS (cm) Age (wd) ±SD (wd)
1.0 4w0d 1w0d 4.1 9w0d 2w0d
1.6 5w0d 1w1d 4.8 10w0d 2w1d
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