TSH
EndocrineNormal range
0.4–4.0 mIU/L (lab-specific)
☎ When to call
Not acute in routine care — the exceptions are myxedema coma (hypothermic, obtunded hypothyroid) and thyroid storm (fever, tachycardia, agitation): both are emergencies.
What you do
- Backwards from intuition: HIGH TSH = LOW thyroid function
- Levothyroxine: give on an empty stomach, same time daily, apart from calcium/iron
Causes of HIGH tsh
Causes of LOW tsh
Source: Pagana, Mosby's Manual of Diagnostic and Laboratory Tests, 7th ed.Reference only — verify against your facility's policy.
