Table 1 Grading system used to score WBCT results at both reading times

Grade 0

Normal coagulation

Stable, solid clot that maintains its shape and clings to the glass vessel without issues after rotation of the tube.

Grade 1

Abnormal, but there is some clotting activity apparent at the 20^th and 30^th minutes

There is some blood in solid form, but it fails to adhere to the glass as a single plug and either disintegrates completely (friable clot) or partially degrades ≤30 sec after rotation.

Grade 2

Abnormal with no clotting activity apparent at the 20^th and 30^th minutes

The entire blood sample remains in a free-flowing liquid state with no demonstrable clotting whatsoever upon rotation. This is immediately apparent during rotation of the tube.