Reagent and method for measuring hemoglobins

A reagent for measuring hemoglobins used for measuring hemoglobins by cation exchange liquid chromatography, comprising:

• a nonionic surfactant or an amphoteric surfactant,
• the nonionic surfactant being Component A1 below, Component A2 below, Component A3 below, Component A4 below, Component A5 below, Component A6 below, Component A7 below, Component A8 below, or Component A9 below, and
• the amphoteric surfactant being Component B1 below, Component B2 below, or Component B3 below:
• Component A1:
• Polyoxyethylene alkyl ether having an average number of moles of an oxyethylene group added of 8 or more and 20 or less, and a carbon number of an alkyl group of 12 or more and 17 or less
• Component A2:
• Polyoxyethylene stearyl ether having an average number of moles of an oxyethylene group added of 40 or more and 60 or less
• Component A3:
• Polyoxyethylene oleyl ether having an average number of moles of an oxyethylene group added of 9 or more and 15 or less
• Component A4:
• Polyoxyethylene-sec-alkyl ether having an average number of moles of an oxyethylene group added of 6 or more and 10 or less, and a carbon number of an alkyl group of 11 or more and 15 or less
• Component A5:
• Polyoxyethylene tridecyl ether having an average number of moles of an oxyethylene group added of 15
• Component A6:
• Polyoxyethylene polyoxypropylene alkyl ether having an HLB value of 11 or more and 15 or less
• Component A7:
• n-nonanoyl-N-methyl-D-glucamine
• Component A8:
• n-octyl-β-D-glucopyranoside
• Component A9:
• Saponin
• Component B1:
• 3-[(3-cholamidopropyl)dimethylammonio]propane sulfonate
• Component B2:
• 3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxypropane sulfonate
• Component B3:
• Lauryl dimethylamine oxide.