Fig. 3From: Modified enzyme multiplied immunoassay technique of methotrexate assay to improve sensitivity and reduce costDistribution plot of MTX concentration in the range of 0–2.00 μmol/L, N = 145. X-axis represented the concentration of MTX, Y-axis represented the cumulative frequency (%) of every concentration levels. The cumulative frequency of concentration between 1.00–2.00 μmol/L was less than 3%Back to article page