Both of your TSH results (9 and 5.6) are above the optimal target range. Since you are also experiencing symptoms, it indicates that your current dose of Thyronorm (levothyroxine) may need to be slightly increased. Fluctuations between different laboratories are quite common and not a cause for alarm. I highly recommend consulting your doctor with these reports. They will likely adjust your daily levothyroxine dosage safely and schedule a follow-up blood test in 6 to 8 weeks to monitor your progress. Please do not alter your medication dose without your doctor's direct guidance.

Since you have been taking Thyronorm (thyroxine sodium) for 13 years and are experiencing slow growth, it is important to consult a pediatric endocrinologist. Your body's thyroid hormone requirements change as you grow, so your doctor will likely order blood tests (TSH and Free T4) to see if your current dose needs adjustment. Additionally, they may check your bone age and screen for nutrient absorption issues, like celiac disease, which can keep you underweight. Please do not change your dose without medical supervision. Your doctor will help tailor a safe, supportive plan to encourage healthy growth and weight gain.