Description
Why It’s Done:
The Gram stain is performed to:
• Identify bacterial infections in samples such as blood, sputum, urine, wounds, or cerebrospinal fluid.
• Guide antibiotic therapy by providing a rapid clue about the type of bacteria (Gram-positive vs. Gram-negative).
• Assist in diagnosing conditions such as pneumonia, urinary tract infections, meningitis, wound infections, and sexually transmitted infections.
• Monitor effectiveness of treatment in some ongoing infections.
Preparation:
Preparation depends on the type of sample being tested:
1. General:
o No special preparation is usually needed unless specified by your doctor.
2. For Specific Samples:
o Urine sample: May require midstream clean-catch technique.
o Sputum sample: You may be asked to rinse your mouth and cough deeply to produce a sample.
o Wound or body fluid: A sterile swab or syringe is used—no prep needed on your part.
o Cervical or urethral swab: You may need to avoid douching or using creams before the test (follow your doctor’s instructions).
3. Medication Disclosure:
o Inform your doctor if you’re taking antibiotics, as they may affect the results.
