# Study to Assess the Occurrence of HPA-1a Alloimmunization in Women With Higher Risk for Fetal and Neonatal Alloimmune Thrombocytopenia

> **NCT05345561** · — · COMPLETED · sponsor: **Rallybio** · enrollment: 14390 (actual)

## Conditions studied

- Fetal and Neonatal Alloimmune Thrombocytopenia

## Interventions

- **OTHER:** Clinical data collection

## Key facts

- **NCT ID:** NCT05345561
- **Lead sponsor:** Rallybio
- **Sponsor class:** INDUSTRY
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** COMPLETED
- **Start date:** 2022-03-14
- **Primary completion:** 2025-01-31
- **Final completion:** 2025-10-10
- **Target enrollment:** 14390 (ACTUAL)
- **Last updated:** 2026-03-06


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05345561

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05345561, "Study to Assess the Occurrence of HPA-1a Alloimmunization in Women With Higher Risk for Fetal and Neonatal Alloimmune Thrombocytopenia". Retrieved via AI Analytics 2026-05-27 from https://api.ai-analytics.org/clinical/NCT05345561. Licensed CC0.

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*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*