**8.3. Clot waveform analysis (CWA)**

CWA is a modified form of aPTT assay, where the light absorbance of the clot measured from the clot initiation to the lysis of the clot and the absorbance is plotted with respect to time using first and second derivates. This assay is more sensitive to measure the changes in FXII, X, IX, VII, V and II levels in the plasma [137, 138].
