Amphetamine-Type Substance Testing in Vitreous Fluid

This test detects and identifies amphetamine-type substances, such as amphetamine, methamphetamine, and related stimulant drugs, in a sample of vitreous fluid, which is the clear gel that fills the inside of the eye.

The Amphetamines in Vitreous Fluid test is a laboratory analysis that detects and measures amphetamine-type stimulants in the vitreous humor—the clear, gel-like substance that fills the space between the lens and retina of the eye. This test uses mass/volume concentration to determine the presence of drugs like amphetamine, methamphetamine, MDMA (ecstasy), and related substances.

A vitreous fluid sample is collected with a fine needle and syringe, usually through a small puncture near the front of the eye. The procedure is most often performed by a trained medical examiner, pathologist, or other qualified professional in a controlled setting.

A healthcare professional collects a small sample of vitreous fluid from the eye using a thin needle. This procedure, called vitreous aspiration, is typically performed by an ophthalmologist or trained medical professional. The sample is then sent to a laboratory for analysis using specialized techniques such as mass spectrometry.

Vitreous fluid is often used because it is relatively protected from contamination and from the chemical changes that occur after death, so drug levels there can remain more stable and may better reflect substances that were present around the time of death.

Vitreous fluid is an excellent sample for drug testing because it is relatively isolated from the bloodstream and less susceptible to contamination. It also remains stable for longer periods after collection, making it particularly valuable in forensic investigations, postmortem examinations, and cases where blood or urine samples are not available.