Thyroid Function Test (TSH)
Blood test checking thyroid hormone levels to ensure proper thyroid function during pregnancy.
📅 When Performed
First prenatal visit, repeated if abnormal
⏱️ Results Timeline
1-3 days
Overview
Thyroid function testing measures TSH (thyroid stimulating hormone) and sometimes T4 to check if your thyroid is working properly. The thyroid gland controls metabolism, and thyroid problems are more common in pregnant women.
Both hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid) can affect pregnancy and baby's development. Untreated thyroid problems can lead to miscarriage, preterm birth, or developmental issues.
Women with known thyroid conditions are tested regularly during pregnancy. Those without prior thyroid problems may be tested if they have symptoms or risk factors.
🎯 Purpose of Test
- •Screen for hypothyroidism (underactive thyroid)
- •Screen for hyperthyroidism (overactive thyroid)
- •Monitor thyroid levels in women with known thyroid disease
- •Ensure adequate thyroid hormone for baby's brain development
- •Prevent pregnancy complications from thyroid problems
🔬 How It's Performed
- 1.Simple blood draw from arm
- 2.Measures TSH (primary test)
- 3.May also measure T4, T3, or thyroid antibodies
- 4.No fasting required
- 5.Results in 1-3 days
- 6.Repeated periodically if abnormal
👀 What to Expect
- →Standard blood test
- →Usually part of first prenatal panel
- →Quick results
- →If abnormal, medication prescribed
- →Regular monitoring if on thyroid medication
- →Dose adjustments common during pregnancy
✓ Normal Results
TSH 0.5-2.5 in first trimester, 0.5-3.0 in second/third trimester (ranges vary slightly)
⚠️ Abnormal Results
- •High TSH: Hypothyroidism, need thyroid hormone replacement
- •Low TSH: Hyperthyroidism, may need medication to reduce thyroid
- •Untreated thyroid problems affect baby's development
- •Need medication adjustment and regular monitoring
- •Endocrinologist consultation may be needed
- •Recheck thyroid levels every 4-6 weeks
⚠️ Risks & Considerations
- •No risks from test - standard blood draw
📝 How to Prepare
- →No fasting needed
- →If on thyroid medication, take as prescribed
- →Inform doctor of any thyroid history
- →Let provider know about family history