Case Report
Delayed Diagnosis of Congenital Hypothyroidism in a Child with Trisomy 21 and Biotinidase Deficiency and Successful Use of Levothyroxine Sodium Oral Solution
Figure 1
Thyroid-stimulating hormone (TSH) and free thyroxine (FT4) timeline. Normal ranges shown are those used by the author’s institution. L-T4, levothyroxine sodium oral solution; WOL, weeks of life.