We report the results obtained with a modification of Hillmann's method (1) for determination of the catalytic concentration of
acid phosphatase in serum using
alpha-naphthylphosphate as the substrate. In a group of 158 males aged 16-85 years, the upper limit of the reference range (95th percentile) for the total
acid phosphatase was established as 4.7 U/l (37 degrees C) and 4.2 U/
l (30 degrees C), respectively; the corresponding values for the
tartrate-inhibited
acid phosphatase were 1.6 U/l (37 degrees C) and 1.5 U/
l (30 degrees C). The upper limit of the reference range (95th percentile) for the total
acid phosphatase determined in 60 females aged 18-80 years was 3.7 U/l (37 degrees C) and 3.0 U/
l (30 degrees C). The catalytic concentrations in men and women did not show any age-related differences. The catalytic concentration of the
tartrate-inhibited
acid phosphatase was determined with the substrates
alpha-naphthylphosphate and p-
nitrophenylphosphate in a group of 89 patients with prostatic
carcinoma (stages C and D). In 74 of these patients, the concentration of the
prostatic specific acid phosphatase was assayed by
enzyme-immunoassay and radioimmunoassay. The sensitivity of the method with p-
nitrophenylphosphate was found to be unsatisfactory (66%), while that obtained with the other methods was superior and intercomparable (approx. 90%). The results obtained with the two substrates (p-
nitrophenylphosphate vs.
alpha-naphthylphosphate) differed significantly.(ABSTRACT TRUNCATED AT 250 WORDS)