Diagram of a double-gap concentric cylinder measurement geometry.

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Diagram of a double-gap concentric cylinder measurement geometry. Diagram of a double-gap concentric cylinder measurement geometry. The double-gap geometry consists of a stationary cup or stator into which a 6.6 mL sample of blood is added after which a bob that is free to rotate called a rotor is then lowered into the sample. The movement of the rotor is controlled by an AR-G2-controlled stress rheometer and will oscillate at four different frequencies (0.20, 0.43, 0.93 and 2.00 Hz) sequentially over time. Ahmed Sabra et al. Open Heart 2017;4:e000562 ©2017 by British Cardiovascular Society