A cell analysis method, comprising introducing a blood or biological fluid test sample into multiple wells of a medical analysis device to capture cancer cells, and then counting the number of cancer cells in the blood or biological fluid test sample in at least one of the multiple wells, increasing the number of cancer cells by culturing in the wells that are not used to count the number of cancer cells, and then determining an effect of a drug on the cancer cells, wherein the medical analysis device comprises multiple wells, wherein the multiple wells comprise a counting well and a culturing well, wherein each well has a hydrophilic polymer layer formed at least partly on an inner surface thereof, and the hydrophilic polymer layer is formed of at least one selected from the group consisting of (a) poly(meth)acryloylmorpholine, (b) a polymer represented by the following formula: wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group, m represents 1 to 5, and n represents the number of repetitions, and (c) a copolymer of at least one hydrophilic monomer selected from the group consisting of (meth)acryloylmorpholine and a compound represented by the following formula (I-1): wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group, and m represents 1 to 5, with a second monomer, wherein the culturing wells are not used to count the number of cancer cells. introducing a blood or biological fluid test sample into multiple wells of a medical analysis device to capture cancer cells, and then counting the number of cancer cells in the blood or biological fluid test sample in at least one of the multiple wells, increasing the number of cancer cells by culturing in the wells that are not used to count the number of cancer cells, and then determining an effect of a drug on the cancer cells, wherein the medical analysis device comprises multiple wells, wherein the multiple wells comprise a counting well and a culturing well, wherein each well has a hydrophilic polymer layer formed at least partly on an inner surface thereof, and the hydrophilic polymer layer is formed of at least one selected from the group consisting of (a) poly(meth)acryloylmorpholine, (b) a polymer represented by the following formula: wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group, m represents 1 to 5, and n represents the number of repetitions, and (c) a copolymer of at least one hydrophilic monomer selected from the group consisting of (meth)acryloylmorpholine and a compound represented by the following formula (I-1): wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group, and m represents 1 to 5, (a) poly(meth)acryloylmorpholine, (b) a polymer represented by the following formula: wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group, m represents 1 to 5, and n represents the number of repetitions, and (c) a copolymer of at least one hydrophilic monomer selected from the group consisting of (meth)acryloylmorpholine and a compound represented by the following formula (I-1): wherein R 1 represents a hydrogen atom or a methyl group, R 2 represents an alkyl group, and m represents 1 to 5, with a second monomer, wherein the culturing wells are not used to count the number of cancer cells.