"Using the Insulin unit conversion method (1 µIU/mL = 0.04 ng/mL), can this be applied to measurements taken by ELISA (pg/mL) rather than ECLIA (Electrochemiluminescence Immunoassay)? This particular ELISA (MILLIPLEX Human Metabolic Hormone Panel, www.merckmillipore.com) is not a commonly used method in clinical practice."