Table 10.

Haematological and biochemical blood test monitoring schedule following vertical sleeve gastrectomy, roux-en-Y gastric bypass and bilopancreatic diversion with duodenal switch^{23 24}.

Blood test	Vertical sleeve gastrectomy	Roux-en-Y gastric bypass Bilopancreatic diversion with duodenal switch
Full blood count	At 3,6 and 12 months in the first year, annually thereafter	At 3,6 and 12 months in the first year, annually thereafter
Urea and electrolytes	At 3,6 and 12 months in the first year, annually thereafter	At 3,6 and 12 months in the first year, annually thereafter
Liver function	At 3,6 and 12 months in the first year, annually thereafter	At 3,6 and 12 months in the first year, annually thereafter
Iron studies, Folate, Ca2+, Vit D, PTH	At 3,6 and 12 months in the first year, annually thereafter	At 3,6 and 12 months in the first year, annually thereafter
Vitamin B12	6 monthly first year, annually thereafter. Consider sooner if anaemia or peripheral neuropathy No need to monitor if receiving intramuscular B12 injections	6 and 12 months in first year, annually thereafter. Consider sooner if anaemia or peripheral neuropathy No need to monitor if receiving intramuscular B12 injections
Zinc, copper	Not routinely	Annually. Consider sooner if unexplained anaemia, hair loss, change in taste acuity, poor wound healing
Selenium	Not routinely	Not routinely. Consider if unexplained fatigue, anaemia, metabolic bone disease, diarrhoea, heart failure
Vitamin A	Not routinely	Annually for BPD-DS. Consider in RYGB if steatorrhoea or night blindness
Vitamin E, K	Not routinely	Not routinely. Consider if unexplained anaemia, peripheral neuropathy, coagulopathy

BPD-DS, bilopancreatic diversion with duodenal switch; Ca2+, calcium; PTH, parathyroid hormone; RYGB, roux-en-Y gastric bypass; Vit D, vitamin D.