b12 injections safe in pregnancy are during The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine Vitamin B12: Symptoms, Dosage &
Description
Chronic myelogenous leukemia, promyelocytic leukemia, polycythemia vera and hypereosinophilic syndrome have all been associated with high B12 levels (25)

In Warren MJ, Smith (eds.)

Three ICU units at the anesthesia and critical care department of the Dijon Bourgogne University Hospital

Check if the correct dosage is still in the syringe after removing air bubbles
