Free estriol (E3) is the principal estrogen produced during pregnancy. It is produced by the placenta from dehydroepiandosterone sulfate derived from the fetal liver and adrenals. The test is used as part of the triple marker screen (in association with alpha fetoprotein and chorionic gonadotropin) for Down syndrome.

Free T3 is an important hormone in the regulation of metabolism. Free T3 test measures the amount of T3 hormone in the blood. It is measured as part of a thyroid function evaluation. Most of the thyroid hormone made in the thyroid is in the form of T4. The body's cells convert the T4 to T3, which is the more active hormone. It is the most powerful thyroid hormone, and affects almost every process in the body, including body temperature, growth, and heart rate.

Free T4 is used as a biochemical indicator of thyroid function, and aids the diagnosis and monitoring of both hyperthyroidism and hypothyroidism. It is an amine hormone synthesized and secreted by the thyroid gland and a precursor to triiodothyronine. It is metabolically active form of the hormone.

Freer periosteal elevators are used to reflect soft tissue away from the bone. The elevators are usually double ended, with one long, tapered end and one round, bladed end. It lifts gingival and mucosa from the bone overlying the buccal aspect of the canine root.