Low Dose Aspirin in high-risk pregnancies: The volatile effect of acetylsalicylic acid on the inhibition of platelets uncovered by G. Born’s light transmission aggregometry

•The optimal Aspirin dosage for the prevention of preeclampsia has to be individualized.•Platelet inhibition by Aspirin varies individually between pregnant women.•Increasing Aspirin to 150 mg daily does not necessarily magnify the inhibitory effect.•Optical aggegrometry is used to monitor Aspirin effectiveness in women at risk.