A simple and effective blood diagnostic kit has been developed. This innovation develops a new yet simple blood diagnostic method by using a cotton thread to analyze the blood sample, by using anticoagulant agent and green bromocresol reagent to determine albumin level in the blood. The test requires only 1 - 3 µL of blood sample, and takes only 30 seconds to get the results. No electrical equipments is requires to do the test. This innovation is suitable for applications in remote areas without electricity sources.