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Additional Information Reverse triiodothyronine (rT3) is an isomer of triiodothyronine (T3) with no demonstrated biological activity.1,2 The majority of rT3is produced through peripheral enzymatic monodeiodination of T4 at the 5 position of the inner ring of the iodothyronine nucleus of thyroxine (T4)

Additional Information Reverse triiodothyronine (rT3) is an isomer of triiodothyronine (T3) with no demonstrated biological activity.1,2 The majority of rT3is produced through peripheral enzymatic monodeiodination of T4 at the 5 position of the inner ring of the iodothyronine nucleus of thyroxine (T4)

Test Details Synonyms RA Latex, Turbidimetry RF Titer Rheumatoid Factor (RF) Use Help in the differential diagnosis and prognosis of arthritic disorders. Additional Information Rheumatoid factors are antibodies directed against the Fc fragment of IgG. These are usually IgM antibodies, but

Test Details Synonyms Measles Antibodies Use Determine status or, with paired sera, aid in the diagnosis of recent infection. Additional Information Measles (rubeola) is caused by a paramyxovirus, and despite vaccination programs has had several recent local epidemics. Revaccination appears

Test Details Synonyms Erythrocyte Sedimentation Rate ESR Westergren Sedimentation Rate Use Evaluate the nonspecific activity of infections, inflammatory states, autoimmune disorders, and plasma cell dycrasias.

Test Details Use Electrolyte, acid-base balance; water balance; water intoxication; diagnose dehydration. Hypernatremia occurs in dehydration. For instance, nasogastric protein feeding with insufficient fluids may cause hypernatremia. Hypernatremia without obvious cause may relate to Cushing syndrome,

Test Details Synonyms Culture, Stool, Comprehensive Enteric Pathogens Culture, Routine Feces Culture, Routine Routine Culture, Stool Test Includes Culture; isolation and identification (at an additional charge) of Salmonella, Shigella, and Campylobacter, and detection of enterohemorrhagic E coli

Test Details Synonyms Thyroid Hormone-binding Ratio (THBR). Use Thyroid function test for the diagnosis of hypothyroidism or hyperthyroidism, used with thyroxine (T4) or equivalent to provide free T4 index, FTI. An indirect measure of binding protein, the T3 uptake reflects available binding

Test Details Synonyms Free Testosterone, Direct and Total. Use Evaluate hirsutism and masculinization in women; evaluate testicular function in clinical states where the testosterone binding proteins may be altered (obesity, cirrhosis, thyroid disorders). See individual test descriptions for

Test Details Synonyms Free Testosterone, Direct Use Evaluate hirsutism and masculinization in women; evaluate testicular function in clinical states where the testosterone binding proteins may be altered (obesity, cirrhosis, thyroid disorders).

Test Details Use Testosterone testing is used to evaluate androgen excess or deficiency related to gonadal function, adrenal function, or tumor activity. Testosterone levels may be helpful in men for the diagnosis of hypogonadism, hypopituitarism, Klinefelter syndrome, and impotence (low values).