# Natural Versus Artificial Cycle for Frozen-Thawed Embryo Transfer

> **NCT03642665** · PHASE4 · COMPLETED · sponsor: **Universitaire Ziekenhuizen KU Leuven** · enrollment: 554 (actual)

## Conditions studied

- Embryo Transfer

## Interventions

- **DRUG:** Natural cycle
- **DRUG:** Estradiol Valerate
- **DRUG:** Micronized progesterone

## Key facts

- **NCT ID:** NCT03642665
- **Lead sponsor:** Universitaire Ziekenhuizen KU Leuven
- **Sponsor class:** OTHER
- **Phase:** PHASE4
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2018-09-25
- **Primary completion:** 2024-11-01
- **Final completion:** 2024-11-01
- **Target enrollment:** 554 (ACTUAL)
- **Last updated:** 2025-02-28

## Collaborators

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## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT03642665

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT03642665, "Natural Versus Artificial Cycle for Frozen-Thawed Embryo Transfer". Retrieved via AI Analytics 2026-05-24 from https://api.ai-analytics.org/clinical/NCT03642665. Licensed CC0.

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