Synonym/Acronym:
Tg.
Rationale
Primarily to evaluate for residual or recurrent thyroid cancer. Results may also be elevated in cases of thyroid injury (related to surgery, fine needle biopsy, or thyroiditis) or in response to thyroid-stimulating hormone (TSH) receptor stimulation.
Patient Preparation
There are no food, fluid, activity, or medication restrictions unless by medical direction.
Normal Findings
Method: Chemiluminescent enzyme immunoassay.
| Age | Conventional Units | SI Units (Conventional Units × 1) | |||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 mo–3 yr | 7–50 ng/mL | 7–50 mcg/L | |||||||||||||||||||||||||||||||||||||||
| 4–7 yr | 4–40 ng/mL | 4–40 mcg/L | |||||||||||||||||||||||||||||||||||||||
| 8–17 yr | 0.8–27 ng/mL | 0.8–27 mcg/L | |||||||||||||||||||||||||||||||||||||||
| Adult–older adult | 0.5–40 ng/mL | 0.5–40 mcg/L | |||||||||||||||||||||||||||||||||||||||
| Note: These ranges do NOT apply to patients who have had thyroid surgery. | |||||||||||||||||||||||||||||||||||||||||
Critical Findings and Potential Interventions
N/A
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