Figure 3. Serum L-thyroxine (T4) levels

Serum L-thyroxine (T4) concentrations from individual neonatal rat blood samples are represented by box-and-whiskers plots (11, 12, and 18 samples for control, AIR, and MMI-AIR, respectively, at day 4; 6 samples for each condition at day 10). Serum T4 concentrations were below detectable levels in MMI-AIR rats by day 10. No difference in T4 concentrations was seen between AIR and control rats. The untreated non-acidotic control values were taken from a previously-published study [6], which ran simultaneously with the current study.