Germicidal lamp is a special type of lamp, which produces ultraviolet light. This short-wave ultraviolet light ionizes oxygen to produce ozone and can kill many surface pathogens. This lamp is not coated with a phosphor and is made with special glass that transmits the UV as well as visible light. There are two common types available: low-pressure lamps and medium pressure lamps. Low-pressure lamp produces ultraviolet light in the wavelength of 253.7 nm. Medium-pressure lamps radiate a broadband UV-C radiation, rather than a single line.

The grooved director is used to expand a vein, to help a drain tube or drainage device such as angular spring forceps into a vein for drainage. It is traditionally used in neurosurgery and opthalmic surgery.

Gelfoam is a medical device, intended for application to bleeding surfaces as a hemostatic. It is a water-insoluble, off-white, non-elastic, porous, pliable product usually prepared from purified pork skin gelatin USP granules and water for injection. Gelfoam sterile powder is a fine, dry, heat-sterilized light powder prepared by milling absorbable gelatin sponge.

Glare testing measures the effect of simulated glare on vision function. Disabling glare is often an indication that a cataract has developed. The panel found inadequate evidence that glare testing provides useful information beyond that obtained in a patient's history and eye examination. This testing, however, may be useful for corroborating glare symptoms in a small percentage of cataract patients who complain of glare, yet measure good Snellen visual acuity.

Genetic analysis system is designed for a wide range of sequencing and fragment analysis applications. It performs comparative sequencing, linkage analysis, SNP detection, discovery and validation, mutation detection, and many other applications. It also eliminates gel preparation.

Gamma-GT is a test to measure the amount of the enzyme GGT in the blood. It is used to detect diseases of the liver, bile ducts, and kidney. It is also used to differentiate liver or bile duct disorders from bone disease. It participates in the transfer of amino acids across the cell membrane, and in glutathione (an anti-oxidant) metabolism.

Glucose is a monosaccharide or simple sugar. A glucose test measures the amount of sugar (glucose) in the blood. This test is used to evaluate blood glucose levels. It may be used to diagnose or screen for diabetes and to monitor control in patients who have diabetes.

Guidewires contain a safety wire that is anchored to the inner core proximally and to the outer coil distally to prevent separation of these components. Straight wires are relatively traumatic and are rarely used. J-shaped guidewires have tapered, softer distal ends that can be straightened or curled by moving the inner core relative to the outer coil. Floppy-tip guidewires have no core wire in their distal 10-15 cm and are maximally flexible. It meets the demands of critical care, cardiology, radiology, urology, gastroenterology, and various other invasive catheter procedures.