A sample analyzer for analyzing a sample with a liquid in a container is disclosed. The sample analyzer comprises: a reader that reads an information of a liquid in a container, the information of the liquid being stored in a storage medium; a display; and a controller including a processor and a memory under control of the processor, the memory storing instruction causing the processor to carry out operations comprising: determining whether the sample analyzer is ready to read the information of the liquid by the reader; and causing, when the sample analyzer is determined to be ready, the display to display an indication that indicates the sample analyzer is ready to read the information of the liquid by the reader.