Glucose-6-phosphate dehydrogenase enzyme stability in filter paper dried blood spots

Data suggest that G6PD PT materials can be stored at 4 °C and used for up to one month and can be stored at − 20 °C for one year and yield > 90% enzyme activity. Exposure to warm temperatures, especially with elevated humidity, should be avoided. Desiccant should always be used to mitigate humidity effects.