Purser Wellness approved rule
Unit: pg/mL
Male: 180-914
Female: 180-914
How to read this marker
<150 supports deficiency; 150-400 is often treated as borderline and may warrant MMA/homocysteine review.
The wider testing context
Iron studies are most useful as a pattern. Collection time, fasting status, inflammation, liver disease, and supplementation can shift results.
Using this reference
This is the approved adult, nonpregnant baseline unless the rule explicitly states otherwise. Keep the performing laboratory’s reference interval separate from this Purser Wellness rule. Match units and review the specimen, method, timing, medicines and relevant clinical context before interpreting a result. These pages do not calculate a personal high/low status or prescribe treatment.
A question to bring to your visit
Which parts of the Vitamin B12 rule apply to my report’s method, units and collection conditions, and what other findings should we review alongside it?
Approved by Dr. Daniel Purser, MD · PW-LABS-1.0. The source laboratory’s interval remains separate.
Names you may see
Vitamin B12