Determination of gestational age based on mean sac diameter

Mean sac diameter (mm)	Mean gestational age (weeks)	Gestational age (days)
Mean sac diameter (mm)	Mean gestational age (weeks)	Mean	95% confidence interval	95% prediction interval
2	5	34.5	34.2-35.5	31.6-38.2
3	5.1	35.8	35.2-36.3	32.5-39.1
4	5.2	36.6	36.1-37.2	33.3-39.9
5	5.4	37.5	37-38	34.2-40.8
6	5.5	38.4	37.9-38.9	35.1-41.7
7	5.6	39.3	38.9-39.7	36-42.6
8	5.7	40.2	39.8-40.6	36.9-43.5
9	5.9	41.1	40.7-41.4	37.8-44.3
10	6	41.9	41.6-42.3	38.7-45.2
11	6.1	42.8	42.5-43.2	39.5-46.1
12	6.2	43.7	43.4-44	40.4-47
13	6.4	44.6	44.3-44.9	41.3-47.9
14	6.5	45.5	45.2-45.8	42.2-48.7
15	6.6	46.3	46-46.6	43.1-49.6
16	6.7	47.2	46.9-47.5	44-50.5
17	6.9	48.1	47.8-48.4	44.8-51.4
18	7	49	48.6-49.4	45.7-52.3
19	7.1	49.9	49.5-50.3	46.6-53.2
20	7.3	50.8	50.3-51.2	47.5-54
21	7.4	51.6	51.2-52.1	48.3-54.9
22	7.5	52.5	52-53	49.2-55.8
23	7.6	53.4	52.9-53.9	50.1-56.7
24	7.8	54.3	53.7-54.8	51-57.6
25	7.9	55.2	54.6-55.7	51.9-58.5
26	8	56	55.4-56.7	52.7-59.4
27	8.1	56.9	56.3-57.6	53.6-60.3
28	8.3	57.8	57.1-58.5	54.5-61.1
29	8.4	58.7	58-59.4	55.4-62
30	8.5	59.6	58.8-60.4	56.2-62.9

Mean diameter of gestational sac and corresponding estimates of gestational age.

Reproduced with permission from: Daya S, Woods S, Ward S, et al. Early pregnancy assessment with transvaginal ultrasound scanning. CMAJ 1991; 144:441. Copyright © 1991 Canadian Medical Association. This work is protected by copyright and the making of this copy was with the permission of Access Copyright. Any alteration of its content or further copying in any form whatsoever is strictly prohibited, except as otherwise permitted by law.

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Determination of gestational age based on mean sac diameter