Complete Blood Count (CBC): A Routine Blood Test to Check Your Overall Health and Screen for Many Different Conditions

This test is a common blood test that measures the different cells in your blood, including red blood cells, white blood cells, and platelets, giving your care team a broad picture of your overall health.

The urine amphetamine/methamphetamine test is a screening test that detects the presence of amphetamine and methamphetamine in your urine. These are stimulant drugs that affect the central nervous system. The test is commonly used by employers, healthcare providers, and legal authorities to check for recent drug use.

Your doctor may order this test as part of a routine checkup, to help find the cause of symptoms such as fatigue, weakness, fever, or easy bruising, or to monitor an ongoing condition and how well a treatment is working.

This test may be ordered for several reasons: pre-employment screening, random workplace drug testing, monitoring patients in substance abuse treatment programs, legal or forensic investigations, or evaluating patients with symptoms of drug use. Healthcare providers may also order this test to monitor medication compliance in patients prescribed stimulant medications.

A healthcare professional will draw a small sample of blood, usually from a vein in your arm, using a thin needle. The procedure usually takes only a few minutes, and you may feel a quick pinch when the needle goes in.

You will be asked to provide a urine sample in a sterile container. The collection is usually done under supervision to ensure sample integrity, especially in workplace or legal testing situations. The sample is then sent to a laboratory where it is analyzed using immunoassay screening methods. If the initial screen is positive, confirmatory testing using more specific methods like gas chromatography-mass spectrometry (GC-MS) may be performed.

Results within the typical ranges generally suggest that your blood cell counts are normal. Abnormal values may point to problems such as anemia, infection, inflammation, clotting or bleeding issues, or blood disorders that may need further evaluation.

A negative result means no amphetamines were detected in your urine at the time of testing, or the level is below the test's cutoff threshold. A positive result indicates that amphetamine or methamphetamine was detected. However, a positive screening test does not necessarily mean impairment—it only indicates recent use. Confirmatory testing is typically required to verify positive results and determine the specific substance present.

This test provides important clues about your health, but it cannot identify a specific disease on its own. Abnormal results often require additional testing along with a review of your symptoms, medical history, and any medicines you take.

This test has some limitations. Certain prescription medications (such as Adderall, Dexedrine, or cold medications containing pseudoephedrine) can cause positive results. Some dietary supplements and foods may also affect results. The test detects use typically within 2-5 days, but this varies based on factors like metabolism, frequency of use, and body mass. False positives can occur, which is why confirmatory testing is important for definitive results.