|Values are valid only on day of printing.|
If vitamin B12 is <150 ng/L, then intrinsic factor blocking antibody (IFBA) is performed. If IFBA is negative or indeterminate, then gastrin is performed.
If vitamin B12 is 150 to 400 ng/L, then methylmalonic acid (MMA) is performed. If MMA is >0.40 nmol/mL, then IFBA is performed.
See Vitamin B12 Deficiency Evaluation in Special Instructions.
Preferred: Red top
Acceptable: Serum gel
Specimen Volume: 4 mL
1. Fasting (8 hours)
2. Divide specimen into 3 plastic vials, 1 containing 1 mL, 1 containing 1.5 mL, and 1 containing 1.5 mL
3. Band specimens together.
Additional Information: This test should not be ordered on patients who have received vitamin B12 injection within the last 2 weeks.
Forms: If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
Neurology Test Request Form-General (T732) (http://www.mayomedicallaboratories.com/it-mmfiles/neurology-request-form.pdf)
Benign Hematology Test Request Form (T755) (http://www.mayomedicallaboratories.com/it-mmfiles/benign-hematology-test-request-form.pdf)
Mild OK; Gross reject
Mild OK; Gross OK