Bazuin et al developed simple rules that can be used to screen for nutrient deficiencies after bariatric surgery. This can make testing more cost efficient. The authors are from Catharina Hospital Eindhoven in The Netherlands/
NOTE: The various cutoffs will vary with the method being used to measure the analyte. Problems in transportability are expected unless the various cutoffs are verified locally.
Parameters:
(1) vitamin A (retinol) in µmol/L
(2) vitamin B1 (thiamin pyrophosphate, TPP) in nmol/L
(3) vitamin B6 in nmol/L
(4) vitamin D (25-OH) in nmol/L
(5) serum folate in nmol/L
(6) serum vitamin B12 in pmol/L
(7) plasma magnesium in mmol/L
(8) ferritin in µg/L
(9) plasma zinc in µmol/L
Nutritional deficiency is
(1) mild if < LLN but above the moderate cutoff.
(2) moderate if less than the moderate cutoff and above the severe cutoff
(3) severe if below the severe cutoff
|
|
Mild
|
Moderate
|
Severe
|
|
vitamin A
|
< LLN
|
< 0.70
|
< 0.35
|
|
vitamin B1
|
< LLN
|
< 70
|
< 55
|
|
vitamin B6
|
< LLN
|
< 35
|
< 20
|
|
vitamin D
|
< LLN
|
< 50
|
< 25
|
|
folate
|
< LLN
|
< 10.4
|
< 6.7
|
|
vitamin B12
|
< LLN
|
< 145
|
< 145
|
|
magnesium
|
< LLN
|
< 0.70
|
< 0.50
|
|
ferritin
|
< LLN
|
< 30
|
< 13 if female. < 23 if male
|
|
zinc
|
< LLN
|
< 10.7
|
< 5.0
|
