A basic analysis including recovery, reproducibility and dilution tests and clinical analysis of the latex photoimmunoassay, LPIA, produced acceptable results. One sample could be processed in a few minutes, which is a much shorter period of time than is required by the RIA or EIA, anzyme immunoassay. Sensitivity was a few nanograms per milliliter. The correlation coefficient with the IRMA was 0.973. Specificity was high and without the influence of various interfering factors in serum. The LPIA, therefore, seems to be a simple but reliable tool for estimating iron storage conditions and a tumor marker for rapidly screening of malignant diseases
