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Synonyms HIV-1/O/2, 4th Generation Test Includes Enzyme immunoassay (EIA) for antigen/antibody screen for HIV with reflex to supplementary differentiation assay for HIV-1 or HIV-2. The antigen/antibody assay detects antibodies to HIV-1 and HIV-2 as well as HIV-1 p24 antigen. Specimens positive

Test Details Synonyms Third-generation TSH Thyrotropin Use Thyroid function test. Investigation of low thyroxine (T4) result; the differential diagnosis of primary hypothyroidism from normal, and the differential diagnosis of primary hypothyroidism from pituitary/hypothalamic hypothyroidism

Test Details Synonyms Free T4, Direct, Serum Free Thyroxine T4, Free, Direct, Serum Use Free T4 may be indicated when binding globulin (TBG) problems are perceived, or when conventional test results seem inconsistent with clinical observations. It is normal in subjects with high thyroxine-binding

Test Details Test Includes Free thyroxine index; T3 uptake (THBR); thyroid-stimulating hormone (TSH); thyroxine (T4)

Test Details Synonyms Antithyroglobulin Antibody Use Detect and confirm autoimmune thyroiditis, Hashimoto thyroiditis

Test Details Synonyms Antimicrosomal Antibody Antithyroid Microsomal Antibody Use Differential diagnosis of hypothyroidism and thyroiditis

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 Biotin Use Measurement of vitamin B7 level Additional Information Biotin is a colorless, water-soluble B-complex vitamin that is also referred to as vitamin B7.1-3 Biotin functions as a cofactor for five mammalian enzymes that catalyze specific carboxylation reactions

Test Details Synonyms A, Vitamin Retinol, Serum Use Differential diagnosis of hypervitaminosis A. A combination of a low serum carotene level and a low vitamin A suggests inadequate vitamin A nutrition.

Test Details Synonyms Tobacco Use Measurement of nicotine and its metabolites to monitor success of smoking cessation programs, detect passive exposure, and evaluate nontobacco nicotine exposure.

Test Details Synonyms 4-Androstenedione δ4-Androstene,3,17-dione.