Results
In patients on MTX therapy the mean (± standard deviation) bias between dipstick and pH meter urine pH was 0.7 ± 0.4, compared to 0.4 ± 0.3 in patients not on MTX. For patients on MTX clinical concordance between dipstick and pH meter urine results was poor around a clinical cut-off of pH 8.0. Of the 92 samples with a meter urine pH ≤ 8.0, 72 had a discordant value by dipstick (pH > 8).