Purser Wellness approved rule
Unit: ng/dL
Male: 0.9-1.7
Female: 0.9-1.7
How to read this marker
Binding abnormalities and severe illness may affect some free-hormone assays.
The wider testing context
Adult, nonpregnant starting intervals. Pregnancy, severe illness, biotin exposure, binding-protein changes, and assay method require separate interpretation.
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 Free T4 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
Free T4