PSA can vary slightly due to lab, prostatic trauma (i.e. via a rectal exam), or infection.
A PSA of 0.9 should be considered normal at any age. If there is concern, this can be repeated - or a free PSA test can be perofmred if there is suspicion of cancer.
PSAs are normally not drawn in 38-year olds unless there is a clinical reason for this test.
This should be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_