A method for treating an individual at risk for a complement-associated disorder is provided, including: (a) obtaining a sample of a body fluid from the individual； (b) measuring a complement activation level in the sample via a point-of-care lateral flow immunoassay； (c) correlating the complement activation level in the sample to a risk of a complement-associated disorder by comparing the complement activation level in the sample to a reference level in a control, wherein a deviation in complement activation level in the sample compared to the reference level in the control indicates the individual is at risk for a complement-associated disorder； (d) selecting a treatment for the individual, based on the correlating of step (c)； and (e) treating the individual with the treatment selected in accordance with step (d). Lateral flow immunoassays and a method of monitoring an individual suffering from a complement-associated disorder are also provided herein.
