8=psa pressure swing absorb Pressure swing adsorption (psa for short) method recovers or purifies hydrogen from hydrogen-rich gas streams. By changing the operating conditions, hydrogen of different purity can be produced, and the purity of hydrogen can reach 99.99. The half-life of Psa is 2 to 3 days. Judgment of psa results: total serum psa > 4ng/ml is abnormal. Those with abnormal psa for the first time need to be reexamined. Patient serum psa levels are affected by factors such as age and prostate size. Serum total psa.
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