Correct, because the conversion of prothrombin (II) into thrombin (IIa) will convert Fibrinogen into Fibrin. The "Prothrombin Time" is the time that it takes for prothrombin to stay in solution (not converted). So, everything before conversion of the fibrinogen to fibrin, by thrombin, is PT.
The assay is done by adding TF, phospholipids, and Ca++ to the plasma.
But it's easier to remember 7, and then 10 5 2 1 -> clot (detected optically) is common.
In testing APTT, you *ADD* phospholipid + Ca++ + activator. The time phospholipid + Ca++ (partial thromboplastin (thromboplastin is phospholipid + TF, whereas partial is without TF)) remains in solution without forming a clot is the time it takes for 12 11 9 8 to come together and cleave 10 5 2 1 -> clot (detected optically). Note that TF is NOT used.
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