There are many international guideline websites, so we have concentrated on those websites which include primarily transfusion-related guidelines:

Ongoing Trials

If you are interested in current or ongoing clinical trials, there is a wide variety of national and international clinical §trial databases and trial registries available. Below is a list of the most current and useful databases and trial registries to search.
  • World Health Organisation's International Clinical Trials Portal (WHO ICTRP) – This is usually the best place to start, as the ICTRP is a large database compiled of trial registration datasets from 16 major international trial registries (six updated weekly, ten updated monthly), offering simple and advanced search options. Access here ( or here from smartphones (
  • – An international trial registry and results database run by the US National Institutes for Health, containing over 180,000 trials from 187 countries (
  • ISRCTN Registry - UK trial registry, hosted by BioMed Central, containing over 13,000 ongoing randomised controlled trials from the UK and abroad (
  • European Union Clinical Trials Register (EU-CTR) – EU trial register which currently contains more than 24,000 ongoing interventional clinical trials conducted within the European Union or European Economic Area (