If its above 600 pg/mL, functional deficiency is unlikely (though not impossible in rare cases)
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Nat Rev Immunol 20(6):375388
1 2 3 "Release of beta-nicotinamide adenine dinucleotide upon stimulation of postganglionic nerve terminals in blood vessels and urinary bladder"
doi:10.1177/0091270010372625 32
Tell patients to inject into their upper leg (front of the thigh), lower stomach (keep 2 inches away from your belly button), or upper armbut make sure they can clearly see the pen window while injecting Do not inject into an area where the skin is tender, bruised, red, or hard