A method for identifying physiological conditions associated with the pH or the buffer capacities of biological fluid secreted from a person, by providing a secretion-monitoring article of a body that includes an absorbent material for absorbing a biological fluid secreted from a person and an indicator system having a hydrophobic chemical composition that includes an indicator agent and an ion-balance reagent, at specific relative amounts. Optionally, a competitive agent for establishing a pre-set threshold of an analyte of interest in a tested bodily fluid, is added to the indicator system, wherein the indicator reagent being charged oppositely to the analyte of interest and the competitive reagent having the same charge as the indicator reagent.