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Table 1 Inclusion and exclusion criteria

From: The link between obesity and vitamin D in bariatric patients with omega-loop gastric bypass surgery - a vitamin D supplementation trial to compare the efficacy of postoperative cholecalciferol loading (LOAD): study protocol for a randomized controlled trial

Inclusion

Exclusion

Men and women ages 18–100 years

Another planned form of bariatric surgery

Planned OLGB

Hypercalcemia (calcium >2.63 mmol/L) or hypocalcemia (calcium <1.75 mmol/L)

25-OHD <75 nmol/L

Renal insufficiency (creatinine >133 μmol/L or GFR <50 ml/min)

BMI >40 or ≥35 kg/m2 with comorbidities

Primary hyperparathyroidism

Body weight <150 kg (owing to limitation of DEXA measurement)

Malignancy

Capability to consent

Infection (e.g., HIV)

Medical conditions requiring daily calcium supplements or antacid use

Known hypersensitivity to cholecalciferol

No capability to consent

Imprisoned persons

  1. Abbreviations: BMI body mass index, DEXA dual-energy X-ray absorptiometry, GFR glomerular filtration rate, 25-OHD 25-hydroxy-vitamin D, OLGB omega-loop gastric bypass