• No Fasting Required: You may eat and drink normally before the test. Fasting is not necessary, as food intake does not significantly affect the number of circulating T cells.
• Consistency in Timing: Immune cell counts can fluctuate slightly throughout the day due to circadian rhythms. If you are undergoing serial monitoring, it is often recommended to have your blood drawn at approximately the same time of day for each test to ensure consistent comparisons.
• Health Status Disclosure: Inform the clinical team if you currently have an active infection (like a cold or flu) or have recently received a vaccination. These factors can cause a temporary spike or dip in your CD4 count that may not reflect your true baseline immune status.
• Medication History: Provide a list of all current medications, particularly immunosuppressants, steroids, or antiretroviral drugs, as these directly influence the production and activity of T-cells.
• Rest and Hydration: Ensure you are well-rested and hydrated. Stress and extreme physical exhaustion can occasionally cause minor, temporary fluctuations in white blood cell levels.

The CD4 Cell Count is one of the most important biomarkers in modern immunology. At Scan4Health, this test provides a multi-dimensional view of a patient’s health:

Key clinical applications include:

• Staging and Diagnosis: In the context of HIV, the CD4 count helps determine the stage of the infection. A higher count typically indicates a more robust immune system, while a lower count indicates that the virus has caused significant damage to the body’s defenses.
• Monitoring Treatment Efficacy: For those on medication, a rising CD4 count is a positive sign that treatment is successfully suppressing viral activity and allowing the immune system to recover.
• Preventive Care Strategy: Doctors use CD4 results to decide when to prescribe prophylaxis (preventive medications) to protect the patient from opportunistic infections that occur when the immune system is weakened.
• Transplant and Autoimmune Management: Beyond viral infections, the CD4 count helps monitor patients on immunosuppressive therapy, ensuring their immune levels remain within a safe range—low enough to prevent organ rejection or autoimmune flares, but high enough to fight off common pathogens.