Editorial Policy & Clinical Verification Standards
At Pregnancy Calculator, we recognize that pregnancy calculations, conception windows, and fetal development timelines directly inform real-world family decisions and prenatal expectations. Because reproductive health is a critical Your Money or Your Life (YMYL) topic, our platform adheres to rigorous clinical standards, transparent source attribution, and active physician review.
Clinically Vetted by Licensed Specialists
Every article, calculation algorithm, and gestational timeline is written by credentialed maternal health writers and rigorously reviewed by our Medical Advisory Board, led by Dr. Sarah Jenkins, MD, FACOG and Elena Rostova, MSN, CNM, WHNP-BC.
Meet the Full Medical Advisory Board →1. Evidence-Based Source Hierarchy
We do not source medical claims from commercial lifestyle blogs, sponsored wellness forums, or unverified secondary aggregators. Every calculation formula, gestational timeline, and clinical guide on Pregnancy Calculator is derived strictly from primary medical authorities:
Professional Obstetrical Colleges
Guidelines from the American College of Obstetricians and Gynecologists (ACOG), the Society for Maternal-Fetal Medicine (SMFM), and the Royal College of Obstetricians and Gynaecologists (RCOG) form our primary baseline for pregnancy dating and ultrasound reconciliation.
Government Public Health Agencies
Data from the Centers for Disease Control and Prevention (CDC), National Institutes of Health (NIH), and World Health Organization (WHO) are utilized for gestational viability benchmarks and maternal health statistics.
Peer-Reviewed Clinical Literature
Peer-reviewed studies in major journals, including the American Journal of Obstetrics & Gynecology (AJOG), Obstetrics & Gynecology (The Green Journal), and The New England Journal of Medicine (NEJM).
2. The 5-Stage Editorial & Algorithm Review Lifecycle
Initial Research & Clinical Synthesis
Our medical writers review the latest consensus statements from clinical bodies. Key parameters (such as the standard 280-day gestational period, luteal phase assumptions, and crown-rump length standard deviations) are referenced directly against primary publications.
Physician & Clinical Review
Draft guides and medical explanations are evaluated by a board-certified obstetrician or licensed nurse-midwife. They verify anatomical accuracy, clinical risk communications, and diagnostic nuance, ensuring information aligns with bedside prenatal reality.
Algorithmic Testing & Boundary Verification
Every mathematical formula used in our interactive calculators undergoes automated unit testing. We test corner cases including leap years, daylight saving time adjustments, short cycle lengths (20–27 days), and prolonged cycle lengths (29–45 days) to ensure zero algorithmic drift.
Plain-Language Translation & Accessibility
Complex perinatology concepts (such as embryonic age vs. gestational age or Naegele's cycle-offset adjustments) are translated into clear, empathetic, and accessible language suitable for non-medical audiences without sacrificing clinical precision.
Continuous Monitoring & Re-Verification
Medical guidelines evolve. Our team periodically monitors major updates from ACOG and perinatology journals. When clinical definitions or biometric curves are adjusted, our tools and articles are systematically revised with updated review timestamps.
3. Transparent Corrections Policy
We are committed to prompt and transparent corrections. If a factual error, calculation inaccuracy, or outdated clinical reference is identified by our team or submitted by a reader:
- Immediate Investigation: The editorial and clinical team verifies the report against primary obstetrical sources within 24–48 hours.
- Algorithmic Remediation: If code logic is affected, changes are regression-tested and deployed with high priority.
- Public Notation: Substantive factual corrections are documented directly on the relevant page with an updated modification timestamp.
4. Commercial Independence & Editorial Neutrality
Pregnancy Calculator maintains absolute independence from pharmaceutical manufacturers, medical device companies, and private clinic networks. We do not accept sponsored ranking placements, paid endorsements of fertility drugs, or commercial content designed to steer patients toward proprietary prenatal testing services.
Our mission is singular: providing free, accessible, scientifically robust tools to help expectant parents navigate pregnancy with clarity, confidence, and peace of mind.