Blood is the fluid which flows in the blood vessels. it transports substances like digested food from the small intestine to the other parts of the body. it carries oxygen from the lungs to the cells of the body. it also transports waste for removal from the body. blood contains different kind of cells suspended in it such as plasma, red blood cells, white blood cells and platelets. apart from the cells blood also contains potassium and sodium. potassium is an electrolyte that is essential for proper muscle and nerve function. minor increase or decrease in the amount of potassium in blood can result in serious health problems. higher-than-normal levels of potassium in blood can result in hyperkalemia which may be due to dehydration, type 1 diabetes, addison’s disease and internal bleeding. kidney disease is a common cause of a high potassium level. low potassium can result in hypokalemia which is due to use of water pills (diuretics), diarrhea, and chronic laxative. illness and other medications may also lower potassium levels. sodium is both an electrolyte and mineral. excessive sodium leads to an increased propensity to certain diseases such as gastric cancer, osteoporosis, kidney stones and high blood pressure. the condition arising due to excess sodium in blood is known as hypernatremia which occurs due to low water consumption, drinking salty water, consuming too much salt, excessive sweating, diarrhea, low levels of hormones such as vasopressin, high levels of aldosterone, cushing’s syndrome. low sodium level can be symptomatic of congestive heart failure, kidney disease, hormonal imbalance and dehydration. the condition is called hyponatremia which occur due to severe vomiting or diarrhea, medications including antidepressants and pain medications, taking diuretics (water pills), dehydration, kidney disease or kidney failure, liver disease, heart problems, including congestive heart failure, adrenal gland disorders, such as addison’s disease, hypothyroidism (under active thyroid). normal levels of potassium in healthy human should be between 3.5 to 5.0 milli equivalents per litre of blood whereas normal levels of sodium should be between 135 to 147 milli equivalents per litre. thus, minor increase or decrease in the amount of potassium and sodium in blood can result in serious health problems. the project aims in designing a miniature and portable device to detect the level of potassium and sodium in blood to reduce sudden collapse in humans.