Lupus anticoagulants are a specific type of antiphospholipid antibody that exists in bloodstream. It is actually a protein, which causes blood to clot differently in arteries and veins that it normally should. Along with anticardiolipin antibody, lupus anticoagulant is associated with increased risk of blood clots, which can lead to a variety of complications.

Luteinizing hormone (LH) is a hormone synthesized and secreted by gonadotropes in the anterior lobe of the pituitary gland. In women, LH helps regulate the menstrual cycle and egg production (ovulation). The level of LH in a woman's body varies with the phase of the menstrual cycle. A LH test measures the amount of luteinizing hormone (LH) in a sample of blood or urine. This test is done to find the cause for a couple's inability to become pregnant (infertility).

Lyme antibody serology test is used to detect antigen in urine from patients with lyme borreliosis. It indicates the presence of both IgG and IgM antibodies to B. burgdorferi. The presence of antibody indicates exposure, not active disease. The IgG/IgM ELISA is the most commonly used screening test for the primary diagnosis of lyme disease.

Lyme disease western blot is a sandwich-type immunoassay that allows visualization of the patient's antibodies. This test must be used if the Lyme IgG/IgM antibody serology is equivocal or positive. The western blot involves a highly complex visual determination of protein bands, based on their molecular weights and intensities. The IgM Western blot is often positive in patients with persistent infection.