Kim and Sun used the platelet to lymphocyte ratio (PLR) to identify a trauma patient in the Emergency Room who is at risk for short-term mortality. The authors are from Chosun University in South Korea.
Patient selection: adult with trauma severe enough to trigger trauma team activation
Outcome: 30-day mortality
Parameters in blood sample drawn on arrival:
(1) platelet count per microliter
(2) absolute lymphocyte count per microliter
platelet to lymphocyte ratio =
= (platelet count) / (lymphocyte count)
Interpretation:
• A PLR < 65.35 was associated with an increased risk of short-term mortality.
• In Figure 3 the 30-day survival was 85% for >= 65.35 and 61% for < 65.35.
Performance:
• The area under the ROC curve is 0.74, with the curve in Figure 2 irregular.
• The sensitivity was 0.62 and specificity 0.69, which suggests that the AUROC should be lower.
