Understanding Your Laboratory Test: A Patient Guide to Testing, Sample Collection, and What Your Results Mean

This laboratory test analyzes a sample from your body to give your healthcare provider important information about your health. It helps evaluate how well certain organs and body systems are working and can detect changes that may need further medical attention.

The Amphetamines Screening Test is a laboratory test that detects the presence of amphetamine-type stimulant drugs in gastric fluid (stomach contents). Amphetamines are a class of stimulants that include medications like Adderall, Dexedrine, and methamphetamine. This test uses a screening method to quickly identify whether these substances are present in the stomach.

The sample is usually collected from a vein in your arm using a small needle, a process that takes only a few minutes. Depending on the test, your provider may also ask for a urine, saliva, or swab sample, and you will receive specific instructions to follow beforehand.

A healthcare provider collects a sample of gastric fluid, usually through a nasogastric (NG) tube or during an endoscopy procedure. The sample is then sent to a laboratory for analysis. In some cases, blood (serum) may also be tested to confirm findings.

Your healthcare provider may order this test as part of a routine checkup, to help diagnose the cause of symptoms you are experiencing, to screen for certain conditions, or to monitor how a known condition or treatment is progressing over time.

This test is most commonly ordered in emergency situations when a patient shows symptoms of drug poisoning or overdose. Symptoms may include agitation, rapid heart rate, high blood pressure, dilated pupils, tremors, or unconsciousness. The test helps healthcare providers determine if an amphetamine-type drug is involved so they can provide appropriate treatment.

Results are compared with standard reference ranges. A result within the normal range generally suggests no unusual findings, while an abnormal result does not automatically mean you are ill; it simply indicates that your provider may need to order additional testing or evaluation.

A negative result means no amphetamines were detected in the gastric fluid sample. A positive result indicates that amphetamines or related substances were found. However, screening tests can sometimes produce false positives or false negatives. If the screening test is positive, a confirmatory test (such as mass spectrometry) is usually performed to verify the results and identify the specific substance.

The risks associated with this test are minimal. If your sample is collected through a blood draw, you may feel a brief sting or notice slight bruising or soreness at the needle site, which typically resolves quickly. Serious complications are very rare.

The risks associated with this test are minimal and are primarily related to the sample collection procedure. Inserting a nasogastric tube may cause minor discomfort, gagging, or nosebleed. In very rare cases, the tube could cause injury to the nasal passages or esophagus.