Do you routinely check vitamin K levels in post-bariatric surgery patients?

Vitamin K levels are not checked routinely in post-bariatric surgery patients. Deficiency of this vitamin is very uncommon in patients who have undergone a sleeve gastrectomy and even with Roux-en-Y gastric bypass. There is more potential for deficiency in patients who have had biliopancreatic diversion surgery, where there is severe malabsorption, and routine supplementation with vitamins A, D, E, and K is usually recommended. A review from 2019 suggested that data on vitamin K status in bariatric surgery patients is weak (Sherf-Dagan et al., PMID 31353233). Vitamin K status is difficult to assess due to no gold standard measure per this 2016 review: Shea & Booth, PMID 26729160.

It has been suggested that a vitamin K level may be low with a...