Each GP practice falls under one of these five screening laboratories:
- Universitair Medisch Centrum Groningen
- Symbiant (Hoorn)
- Radboud Universitair Medisch Centrum (Nijmegen)
- Nederland Moleculair Diagnostisch Laboratorium BV (Rijswijk)
- Stichting Jeroen Bosch Ziekenhuis (’s-Hertogenbosch)
Each screening laboratory has its own operating area. Each operating area is around the same size in terms of the number of women in the target group. This means that each screening laboratory conducts analyses for patients from multiple health screening organisations.