 This method is commonly used as a point-of-care (POC) technique to screen for HIV.However, using absorbent pads and chemical solutions could very easily skew the results of immunoassays.Research by Dr. Douglas A. Granger and colleagues shows that outcomes for testosterone, DHEA, progesterone, and estradiol biomarkers are elevated when cotton-based collection materials are used as opposed to samples collected by other methods (i.e.