Uses flow cytometry to count specific types of immune cells (CD20 By Flowcytometry Test).
Helps evaluate immune deficiencies, monitor immune status (e.g., in HIV, transplant or treatment with B-cell therapies) and classify blood disorders.
Recurrent or unusual infections, or monitoring of immune status — as advised by a doctor.
No fasting needed.
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.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood or bone marrow sample (EDTA/heparin tube) as advised by your haematologist.
Usually within 3–4 days after the sample reaches the lab. You will receive the report online.