Thyroid Tests Flashcards
TSH regulation?
serum levels of T3 & T4
stimulates thyroid to produce thyroid hormones, from the anterior pituitary
TSH
most sensitive test for autoimmune thyroid disease
thyroid peroxidase antibodies (TPO Abs)
TSI is helpful for diagnosing?
Graves disease
finding for nodules on thyroid scan
irregular uptake
finding on thyroid scan for Grave’s disease
homogenous uptake
functions of thyroid ultrasound (4)
evaluates size & morphology
evaluates nodules
detects lesions of 2-3mm
guided FNA biopsy
hyperthyroidism lab findings (3)
Low TSH
High/Normal FT4
High/Normal T4 & T3
endogenous causes of hyperthyroidism (4)
Graves disease
Toxic multinodular goiter
toxic adenoma
thyroiditis
exogenous causes of hyperthyroidism (2)
treatment-related
factitious
most common cause of hypothyroidism
Hashimoto thyroiditis
hypothyroidism lab findings (3)
High TSH
Low FT4
Low/Normal T4 & T3
Hashimoto lab findings
4
High TSH
Low FT4
Low/Normal T3 & T4
High TPO Ab
Grave’s disease lab findings (4)
low TSH
high T4 & T3
homogenous uptake
high/normal uptake
abnormal thyroid function tests due to non-thyroidal illness
Sick euthyroid syndrome
