Fig. 3From: Preventing calcium and vitamin D deficiencies following weight loss and metabolic surgerySerum parathyroid hormone levels following obesity surgery. Blue: sleeve gastrectomy. Red: Roux-en-Y Gastric bypass. Normal laboratory values: PTH 1.5-7 pmol/L (shaded blue). Outliers: circle–1.5–3 × interquartile range, asterisk– > 3 × interquartile range above the third quartile or below the first quartileBack to article page