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This historic test consisted, in its first step, of taking an oral dose of radiolabelled vitamin B 12 , followed by quantitation of the vitamin in the patient's urine over a 24-hour period via measurement of the radioactivity
Seeing the rapid effects motivates patients to stick to their recommended protocol
Legitimate suppliers provide certificates of analysis from third-party testing labs
Therefore, intravenous or large-volume regional administration during pregnancy should be reserved for clearly indicated situations, with continuous fetal and maternal monitoring and readiness to institute neonatal resuscitation if systemic toxicity or bradyarrhythmia ensues
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