Phvitf

What is this test?

The Vitreous Fluid pH test measures the acidity or alkalinity of the vitreous humor, which is the clear, gel-like substance that fills the space between the lens and the retina in the eye. The pH level indicates how acidic or alkaline the vitreous fluid is, which can reflect the overall health of the intraocular environment.

Why is this test performed?

This test is typically ordered when a patient has symptoms of eye inflammation, infection, or other ocular conditions. It helps ophthalmologists understand the internal environment of the eye and can aid in diagnosing conditions such as endophthalmitis (infection inside the eye), uveitis, retinal detachment, or other vitreoretinal diseases. The pH value can change in response to inflammation, infection, or metabolic disturbances within the eye.

How is the sample collected?

A small sample of vitreous fluid is collected through a procedure called vitreous tap or vitrectomy. Before the procedure, numbing drops are applied to the eye. A thin needle is then carefully inserted into the eye to withdraw a small amount of fluid. This procedure is performed by an ophthalmologist in a clinical setting. The sample is then sent to a laboratory for pH analysis.

What do the results mean?

Normal vitreous fluid pH typically ranges from about 6.8 to 7.4, which is slightly acidic to neutral. An abnormal pH reading may indicate: acidic pH (below 6.8) may suggest inflammation, infection, or metabolic issues; alkaline pH (above 7.4) may indicate certain inflammatory conditions or other pathological changes. Your eye doctor will interpret these results in conjunction with your symptoms and other diagnostic tests.