Gram Stain Test
- Category
- Infection
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 2 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
A sample is stained with Gram stain and examined under the microscope to identify bacteria and pus cells.
Why this test is performed?
Gives a rapid, early indication of the type of bacteria (Gram-positive or Gram-negative) causing an infection, helping doctors start the right antibiotics while culture results are awaited.
Who should take this test?
Fever, rash, jaundice, suspected exposure to infection, before surgery or pregnancy, as advised by a doctor.
Test Preparation
No fasting needed.
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.
Read our Editorial Policy and Medical Review Process.
- Report time: In 8 days
- No fasting
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Frequently asked questions
No. Culture identifies the exact bacterium and which antibiotics work.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood sample taken from a vein in your arm.
Usually within 23–47 hours after the sample reaches the lab. You will receive the report online.
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