Of the many published methods for determining hydrogen in uranium, those based on complete separation of the gas by vacuum or inert-gas extraction are the most satisfactory. When 5- to 10-gm samples are used, the average operator time can be reduced to about ten minutes per sample for either of these techniques. Routine operation of one inert-gas and six vacuum extraction units has produced an overall laboratory precision of ±0.3 ppm for production material containing up to 7 ppm hydrogen. Improved precision, at a considerable expense of time, can be obtained with larger samples.