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P50

   Also found in: Acronyms, Wikipedia 0.09 sec.
P50
The O2 tension at which Hb is1⁄2 (50%) saturated, a value equal to 26 torr–mm Hg in normal RBCs; the P50 value is obtained from the midpoint of the O2 dissociation curve–O2DC, and does not reflect the shape of the curve; with ↑ O2 affinity, P50 ↓, resulting in a 'left shift' of O2; ↑ P50 indicates ↓ O2 affinity for Hb. See Oxygen dissociation curve.


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