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p.r.n

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p.r.n (pro re nata) (prō ray nahtah),

adv a Latin phrase meaning “occasionally” or “according to circumstances”; the abbreviation is used in prescription writing.

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P-R
P-R interval
P-sinistrocardiale
p-value
p.c
p.c.
p.o.

p.r.n
p.r.n.
p.s.i
p.s.i.
P1
P2
p53
Pa

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