In what is a patient with the following coagulation test results most likely deficient?
$\begin{array}{lll}
\underline { \text { Test }}&\underline { \text { Test Result }}& \underline { \text { Reference range }}\
\text { Prothrombin time (PT) } & 17 \text { seconds } & 11-15 \text { seconds } \
\text { Partial thromboplastin time (PTT) } & 31 \text { seconds } & 25-37 \text { seconds } \
\text { Thrombin time (TT) } & 16 \text { seconds } & 15-21 \text { seconds }
\end{array}$

Question

In what is a patient with the following coagulation test results most likely deficient?
$\begin{array}{lll}
\underline { \text { Test  }}&\underline { \text { Test Result }}& \underline { \text { Reference range }}\
\text { Prothrombin time (PT) } & 17 \text { seconds } & 11-15 \text { seconds } \
\text { Partial thromboplastin time (PTT) } & 31 \text { seconds } & 25-37 \text { seconds } \
\text { Thrombin time (TT) } & 16 \text { seconds } & 15-21 \text { seconds }
\end{array}$

Quizplus · Accepted Answer

The patient is most likely deficient in factor VII, as indicated by the prolonged Prothrombin Time (PT) with normal Partial Thromboplastin Time (PTT) and Thrombin Time (TT). Factor VII is part of the extrinsic pathway, which is evaluated by the PT test.

In What Is a Patient with the Following Coagulation Test