Which hormone tests should be ordered to evaluate abnormal endocrine levels contributing to anxiety and depression in a woman using a levonorgestrel‑releasing intrauterine device?

Hormone Testing for Anxiety and Depression in LNG-IUD Users

Routine hormone testing is not indicated for anxiety and depression in women using levonorgestrel IUDs, as current CDC guidelines do not recommend endocrine evaluation for mood symptoms in contraceptive users, and the LNG-IUD is considered safe for women with depressive disorders. 1

Why Hormone Testing Is Not Recommended

The 2010 U.S. Medical Eligibility Criteria explicitly classifies depressive disorders as Category 1 (no restriction) for LNG-IUD use, meaning there are no contraindications based on mood disorders 1. The most recent 2024 CDC Selected Practice Recommendations for Contraceptive Use do not include hormone testing as part of routine evaluation for mood symptoms in IUD users 2.

When to Consider Thyroid Testing

If you do pursue any endocrine workup, thyroid function is the only hormone panel with evidence-based support:

• TSH and free T4 should be checked if clinically indicated, as thyroid disorders can present with anxiety symptoms and have documented comorbidity with anxiety disorders 3
• The 2024 CDC guidelines specifically mention thyroid disorders as an underlying condition to consider when evaluating contraceptive-related concerns 2

Do NOT routinely order:

• Estrogen levels (LNG-IUD primarily acts locally; systemic estrogen remains largely normal) 4
• Progesterone levels (not clinically useful in this context)
• Cortisol/ACTH (only if specific signs of adrenal insufficiency like hypotension, syncope, or severe fatigue are present) 5

The Evidence on LNG-IUD and Mood

Recent high-quality research contradicts concerns about hormonal IUDs causing mood problems:

• A 2023 prospective cohort study found no clinically important differences in hair cortisol concentrations (a marker of stress axis activation) between LNG-IUD and copper IUD users, and psychometric inventories showed no adverse effects on mood 6
• A 2026 rapid review found HC use did not consistently worsen anxiety or mood symptoms in women with pre-existing mental health disorders, and LNG-IUDs were associated with stable or improved symptoms 7
• The LNG-IUD primarily acts locally on the endometrium with minimal systemic hormonal effects; serum levonorgestrel levels are low (84-314 pmol/L) and most women maintain ovulatory cycles 4, 8, 9

Clinical Approach

Instead of hormone testing, focus on:

1. Assess whether mood symptoms preceded or followed IUD insertion to determine temporal relationship

2. Screen for other causes of anxiety/depression:

   • Thyroid dysfunction (TSH, free T4) if symptoms suggest it
   • Life stressors, sleep disturbance, substance use
   • Underlying psychiatric conditions requiring treatment

3. Discuss patient preferences:

   • If she wants to continue the IUD: Treat mood symptoms independently with appropriate psychiatric care
   • If she wants removal: Remove the IUD, offer alternative contraception 2

Important Caveats

• One 2024 case report described suspected LNG-IUS-induced secondary adrenal insufficiency 5, but this is extraordinarily rare and presented with syncope and hypotension—not isolated mood symptoms
• Some observational studies show associations between progestin-only methods and depression 10, but these are confounded by indication (women with mood disorders may preferentially choose non-estrogen methods)
• The evidence is mixed and heterogeneous, but the highest-quality prospective studies are reassuring 6, 7

Bottom line: Treat the mood symptoms directly rather than pursuing extensive hormone panels that lack evidence-based support in this population.