Home
Radiology Guides Anatomy Physio & Path Medicine Physics Contact
THYROID UPTAKE SCAN

Endocrinology

THYROID UPTAKE SCAN

Thyroid uptake scan = radioactive iodine uptake (RAIU) + scintigraphy scan.

INCREASED RAIU
1. Primary hyperthyroidism = Grave's disease, toxic or active thyroid nodules.
2. Secondary hyperthyroidism = TSH secreting pituitary tumor,  hCG secreting tumor.
3. Decreased iodine availability (hence increased uptake) = Iodine deficiency.

DECREASED RAIU
1. Primary hypothyroidism = thyroiditis (RAIU differentiates Graves from thyroiditis - in Graves the gland is producing more, in thyroiditis the gland is just inflammed).
2. TSH suppression = exogenous T3 or T4, factitious hyperthyroidism.
3. Increased iodine availability = iodine excess.

SCINTIGRAPHY SCAN
1. Hot nodule = hyperfunctioning gland.
2. Cold nodule = hypofunctioning gland, likely malignancy.


Avatar
REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

+ Home