{
"method": "lmp",
"edd": "2026-10-15",
"conception_date": "2026-01-22",
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance."
}
}
curl --location --request POST 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28629/calculate+estimated+due+date' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{"method": "lmp", "lmp": "2026-01-04", "cycle_length": 32}'
{
"method": "ivf",
"edd": "2026-11-17",
"conception_date": "2026-02-24",
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance."
}
}
curl --location --request GET 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28630/get+estimated+due+date?method=ivf&transfer_date=2026-03-01&embryo_age_days=5' --header 'Authorization: Bearer YOUR_API_KEY'
{
"edd_lmp": "2026-10-08",
"edd_ultrasound": "2026-10-21",
"edd_used": "2026-10-21",
"ga_lmp_at_scan": "10w3d",
"ga_ultrasound_at_scan": "8w4d",
"discrepancy_days": 13,
"redated": true,
"rule_applied": "9w0d-13w6d: redate if discrepancy > 7 days (ACOG CO 700 Table 1)",
"within_acog_guideline": true,
"guideline_note": null,
"suboptimally_dated": false,
"formula": "robinson_fleming_1975",
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance.",
"as_of": "2026-03-15",
"citation": "ACOG Committee Opinion 700 (2017, reaffirmed 2022), Table 1."
}
}
curl --location --request POST 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28631/apply+acog+ultrasound+redating+rules' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{"lmp": "2026-01-01", "scan_date": "2026-03-15", "crl_mm": 20}'
{
"edd_lmp": "2026-07-08",
"edd_ultrasound": "2026-06-19",
"edd_used": "2026-07-08",
"ga_lmp_at_scan": "30w2d",
"ga_ultrasound_at_scan": "33w0d",
"discrepancy_days": 19,
"redated": false,
"rule_applied": ">=28w0d: redate if discrepancy > 21 days (ACOG CO 700 Table 1)",
"within_acog_guideline": true,
"guideline_note": null,
"suboptimally_dated": true,
"formula": "hadlock_1984_composite",
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance.",
"as_of": "2026-05-01",
"citation": "ACOG Committee Opinion 700 (2017, reaffirmed 2022), Table 1."
}
}
curl --location --request GET 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28632/get+acog+redating+decision?lmp=2025-10-01&scan_date=2026-05-01&bpd_mm=86&hc_mm=300&ac_mm=280&fl_mm=65' --header 'Authorization: Bearer YOUR_API_KEY'
{
"edd": "2026-10-11",
"gestational_age": {
"label": "29w2d",
"total_days": 205
},
"warnings": [],
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance.",
"as_of": "2026-07-28"
}
}
curl --location --request POST 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28633/calculate+gestational+age' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{"as_of": "2026-07-28", "edd": "2026-10-11"}'
{
"edd": "2026-10-11",
"gestational_age": {
"label": "29w2d",
"total_days": 205
},
"warnings": [],
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance.",
"as_of": "2026-07-28"
}
}
curl --location --request GET 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28634/get+gestational+age?as_of=2026-07-28&lmp=2026-01-04' --header 'Authorization: Bearer YOUR_API_KEY'
{
"edd": "2026-10-11",
"gestational_age": {
"label": "29w2d",
"total_days": 205
},
"trimester": 3,
"is_viable": true,
"term_class_if_delivered_today": "very_preterm",
"milestones": {
"trimester_2_start": "2026-04-12",
"trimester_3_start": "2026-07-19",
"viability": "2026-06-21",
"very_preterm_start": "2026-07-19",
"moderate_preterm_start": "2026-08-16",
"late_preterm_start": "2026-08-30",
"early_term_start": "2026-09-20",
"full_term_start": "2026-10-04",
"late_term_start": "2026-10-18",
"post_term_start": "2026-10-25"
},
"visit_schedule": {
"schedule": "who_2016",
"parity": null,
"visits": [
{
"week": 12,
"date": "2026-03-29"
},
{
"week": 20,
"date": "2026-05-24"
},
{
"week": 26,
"date": "2026-07-05"
},
{
"week": 30,
"date": "2026-08-02"
},
{
"week": 34,
"date": "2026-08-30"
},
{
"week": 36,
"date": "2026-09-13"
},
{
"week": 38,
"date": "2026-09-27"
},
{
"week": 40,
"date": "2026-10-11"
}
]
},
"postpartum": {
"projected_six_week_check": "2026-11-22"
},
"warnings": [],
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance.",
"as_of": "2026-07-28"
}
}
curl --location --request POST 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28635/get+pregnancy+milestones+and+visit+schedule' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{"as_of": "2026-07-28", "edd": "2026-10-11"}'
{
"edd": "2026-10-11",
"gestational_age": {
"label": "29w2d",
"total_days": 205
},
"trimester": 3,
"is_viable": true,
"term_class_if_delivered_today": "very_preterm",
"milestones": {
"trimester_2_start": "2026-04-12",
"trimester_3_start": "2026-07-19",
"viability": "2026-06-21",
"very_preterm_start": "2026-07-19",
"moderate_preterm_start": "2026-08-16",
"late_preterm_start": "2026-08-30",
"early_term_start": "2026-09-20",
"full_term_start": "2026-10-04",
"late_term_start": "2026-10-18",
"post_term_start": "2026-10-25"
},
"visit_schedule": {
"schedule": "who_2016",
"parity": null,
"visits": [
{
"week": 12,
"date": "2026-03-29"
},
{
"week": 20,
"date": "2026-05-24"
},
{
"week": 26,
"date": "2026-07-05"
},
{
"week": 30,
"date": "2026-08-02"
},
{
"week": 34,
"date": "2026-08-30"
},
{
"week": 36,
"date": "2026-09-13"
},
{
"week": 38,
"date": "2026-09-27"
},
{
"week": 40,
"date": "2026-10-11"
}
]
},
"postpartum": {
"projected_six_week_check": "2026-11-22"
},
"warnings": [],
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance.",
"as_of": "2026-07-28"
}
}
curl --location --request GET 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28636/list+pregnancy+milestones?as_of=2026-07-28&edd=2026-10-11&schedule=who_2016' --header 'Authorization: Bearer YOUR_API_KEY'
{
"lmp": "2026-01-01",
"ovulation_estimate": "2026-01-17",
"fertile_window": {
"start": "2026-01-12",
"end": "2026-01-18"
},
"next_periods": [
"2026-01-31",
"2026-03-02",
"2026-04-01"
],
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance."
}
}
curl --location --request POST 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28637/calculate+ovulation+and+fertile+window' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{"lmp": "2026-01-01", "cycle_length": 30, "n": 3}'
{
"lmp": "2026-01-01",
"ovulation_estimate": "2026-01-17",
"fertile_window": {
"start": "2026-01-12",
"end": "2026-01-18"
},
"next_periods": [
"2026-01-31",
"2026-03-02",
"2026-04-01"
],
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance."
}
}
curl --location --request GET 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28638/get+ovulation+and+fertile+window?lmp=2026-01-01&cycle_length=30&n=3' --header 'Authorization: Bearer YOUR_API_KEY'
{
"results": [
{
"index": 0,
"status": 200,
"body": {
"method": "lmp",
"edd": "2026-10-08",
"conception_date": "2026-01-15",
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance."
}
}
},
{
"index": 1,
"status": 200,
"body": {
"edd": "2026-10-11",
"gestational_age": {
"label": "29w2d",
"total_days": 205
},
"warnings": [],
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance.",
"as_of": "2026-07-28"
}
}
}
],
"meta": {
"disclaimer": "Reference implementation. Informational only -- not clinical advice, not for diagnostic use, not contraceptive guidance."
}
}
curl --location --request POST 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28639/batch+multiple+pregnancy+calculations' --header 'Authorization: Bearer YOUR_API_KEY'
--data-raw '{"items": [
{"endpoint": "edd", "params": {"method": "lmp", "lmp": "2026-01-01"}},
{"endpoint": "gestational_age", "params": {"as_of": "2026-07-28", "edd": "2026-10-11"}}
]}'
{
"endpoints": [
{
"path": "/v1/edd",
"methods": [
"conception",
"ivf",
"lmp",
"reverse",
"ultrasound_biometry",
"ultrasound_crl"
]
},
{
"path": "/v1/gestational-age",
"input": [
"edd",
"lmp"
]
},
{
"path": "/v1/redate",
"input": [
"crl_mm",
"bpd_mm/hc_mm/ac_mm/fl_mm"
]
},
{
"path": "/v1/milestones",
"schedules": [
"who_2016",
"acog",
"nice"
]
},
{
"path": "/v1/cycle",
"input": [
"lmp",
"cycle_length",
"luteal_phase_length",
"n"
]
},
{
"path": "/v1/batch",
"max_items": 25,
"endpoints": [
"cycle",
"edd",
"gestational_age",
"milestones",
"redate"
]
}
]
}
curl --location --request GET 'https://zylalabs.com/api/13385/acog+ultrasound+redating+rules+api/28640/list+available+methods+and+parameters' --header 'Authorization: Bearer YOUR_API_KEY'
注册后,每个开发者都会被分配一个个人 API 访问密钥,这是一个唯一的字母和数字组合,用于访问我们的 API 端点。要使用 ACOG Ultrasound Redating Rules API 进行身份验证,只需在 Authorization 标头中包含您的 bearer token。
| 标头 | 描述 |
|---|---|
授权
|
必需
应为 Bearer access_key. 订阅后,请查看上方的"您的 API 访问密钥"。
|
无长期承诺。随时升级、降级或取消。 免费试用包括最多 50 个请求。
(年度计费可节省 2 个月 🎉)
Pregnancy due date and gestational age API. EDD from LMP, conception, IVF transfer day, or ultrasound CRL. ACOG redating rules, trimester, and term milestones. Deterministic ISO 8601 dates.
奈吉尔规则:预产期是最后一次月经的时间加上280天,若月经周期长度不同于28天则需进行调整。你也可以从受孕日期(加266天) IVF转移或超声波测量来计算。每个回答都说明了是哪个公式得出的答案
是的/v1/redate 完全实现了ACOG委员会意见700(2017年,2022年重申)的表1,包括大多数实施遗漏的细节:妊娠年龄行是根据扫描时的末次月经推算的年龄选择的,符合表格自己的脚注,而不是超声波推算的年龄。该响应告诉您哪个规则触发了,天数的差异,以及您发送的测量值是否是ACOG在该妊娠年龄推荐的值
它们是单独计算的:预产期 = 转移日期 + (266 - 胚胎年龄(以天计))。第3天转移的预产期为转移 + 263天,第5天囊胚转移为转移 + 261天,第6天转移为转移 + 260天,取卵为取卵 + 266天。在同一天进行第3天和第5天转移的日期相差两天——这是一般计算器通常会合并的差异
冠尾长使用Robinson–Fleming 1975(Br J Obstet Gynaecol 1975;82:702-710),这是NICE、RCOG和ISUOG所引用的第一孕期标准 BPD、HC、AC和FL使用Hadlock 1984(Radiology 1984;152:497-501),提供所有四个参数使用Hadlock自己的多参数复合回归 每个回应都准确地命名所应用的公式
是的 没有任何端点读取服务器时钟 任何依赖“今天”的计算都需要一个明确的 as_of 日期 如果省略它将返回一个特定的错误而不是沉默的猜测 同样的请求在 /v1 内部会无限返回相同的答案 这使得响应可以安全地缓存和测试
发送 cycle_length_range 作为 [min, max] 而不是单个 cycle_length 响应返回 edd_earliest edd_latest 清晰标记的中点和范围宽度(以天为单位)而不是单个日期以免暗示输入不支持的精度
是的 as_of接受任何日期,因此传递一个过去的交付日期会返回交付时的孕周 /v1/milestones还报告该交付属于哪个妊娠期类别 - 早产期 足月期 晚产期 过期产 或四个早产子类别之一
不API是无状态的不存储任何东西请求日志仅记录端点状态码响应时间以及请求来自哪个市场从未记录日期测量周期长度或计算结果
不这是已发布日期公式和指南表的参考实现用于信息和软件集成使用这不是临床建议不用于诊断也不是避孕指导每个响应在其meta.disclaimer字段中都带有该声明
是的,提供7天的试用,最多可发起50个请求,因此您可以在决定订阅计划之前将计算与您自己的参考案例进行核对