Yes, the shift of the oxygen-hemoglobin dissociation curve is quantified by means of the P₅₀ value (the oxygen tension at which hemoglobin is 50% saturated). The normal P₅₀ value of blood is 27 mm Hg. Decreased levels of 2,3-diphosphoglycerate (normal 4.8 mmol/mL of erythrocytes) cause a leftward shift of the curve, lowering the P₅₀ value and reducing oxygen unloading at the tissues.

References

• Lumb A, Thomas C. Hypoxia. In: Nunn and Lumb's Applied Respiratory Physiology. 9th ed. Elsevier; 2020:273-278.