In the one-stage quantitative assay for factors II, V, VII, and X the __________ is the test system used, with specific-factor-deficient plasmas added to normalize all other factors but the one being measured.

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The one-stage quantitative assay, also known as the prothrombin time (PT) test, uses a test system with factor-deficient plasmas to normalize all other factors except the one being measured (in this case, factors II, V, VII, and X).

In the One-Stage Quantitative Assay for Factors II, V, VII