In which one of the following specimen types is there a strong relationship between it and plasma free drug concentration,but the window of detection is short compared with that in a urine specimen?

Question

Quizplus · Accepted Answer

Oral fluid is known to have a strong correlation with plasma free drug concentration and can provide a window of detection similar to that of urine. However, the window of detection in oral fluid is shorter compared to urine. Serum, on the other hand, has a strong relationship with plasma free drug concentration but has a longer window of detection compared to oral fluid. Meconium and hair have longer windows of detection than urine, but their relationship with plasma free drug concentration is not as strong as oral fluid or serum.

In Which One of the Following Specimen Types Is There