Laryngoscope is a medical instrument that is used to obtain a view of the glottis. A rigid laryngoscope is used for direct laryngoscopy. It consists of a handle (incorporating a battery) and a blade with a light source. Direct laryngoscopy is done with the patient lying on his or her back; the laryngoscope is inserted into the mouth to push away the tongue and lift the epiglottis so that a view of the glottis is possible.

The lanthony tritan contains a demonstration plate and five plates for identifying and grading congenital tritan defects and acquired type 3 defects. The design consists of a square of grey dots with different lightnesses. One corner of the square contains (neutral) blue-purple dots. The blue-purple dots decrease in saturation from plates 1 to 5 to give a series of colour difference steps.

LDL cholesterol is a type of cholesterol. Too much of LDL in the blood can clog arteries. The LDL measures the level of low-density lipoprotein (LDL) in the blood. This test is usually done to determine the patient's risk for heart disease.

Lithium is a drug commonly used to treat bipolar disorder and depressive disorders. It is a positively charged element or particle that is similar to sodium and potassium. It interferes at several places inside cells and on the cell surface with other positively charged atoms such as sodium, potassium, calcium, and magnesium, which are important in many cellular functions. It interferes with the synthesis and retake of chemical messengers by which nerves communicate with each other (neurotransmitters). It also affects the concentrations of tryptophan and serotonin in the brain. In addition, it increases the production of white blood cells in the bone marrow.

Laminaplasty is a procedure performed by spinal surgeons designed to take the pressure off the spinal cord while maintaining both the stability and flexibility of the spine. It appears that such a procedure may avoid some of the complications associated with simple laminectomy. A laminectomy works well to decompress the spinal canal in patients with normal alignment (lordosis) and normal motion in flexion (forward bending) and extension (backward bending).

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).

Lead extraction devices are designed to aid in the percutaneous removal of cardiac leads and catheters. These systems consist of components used in both superior and femoral approach extraction procedures.

Left ventricle restoration system eliminates the guesswork of ventricular restoration by optimizing ventricular size, shape, and orientation. It is a comprehensive surgical therapy for patients suffering from congestive heart failure. It makes surgical ventricular restoration predictable, reproducible and easier. It enables cardiac surgeons to simply, efficiently and reproducibly restore dilated ventricles to a more normal architecture by ensuring the restoration of optimal ventricular size, shape and orientation.