Hematologist
CION Cancer Clinics
Low immunoglobulins and IVIG in CLL | CION Cancer Clinics
Low immunoglobulins mean your body is making fewer antibodies, and it is common in CLL. IVIG, a drip of antibodies from donated plasma, is usually considered only when a low IgG comes with repeated or serious infections, not for a low number alone. This page explains your report, the options, what an IVIG session involves, and what the page cannot decide for you. At CION Cancer Clinics, every leukaemia, MDS and MPN case is reviewed by our haematologist and discussed at a tumour board before a plan is agreed.
BP
Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
On this page
- What does a low immunoglobulin level mean in CLL, and when is IVIG given?
- What do IgG, IgA and IgM mean on a blood report?
- What can be done about low antibodies in CLL?
- What happens at an IVIG session?
- What do families misunderstand about IVIG?
- Who is IVIG not right for, and what can this page not tell you?
- Common questions about low immunoglobulins and IVIG in CLL
The short answer
What does a low immunoglobulin level mean in CLL, and when is IVIG given?
Low immunoglobulins mean your body is making fewer antibodies, the proteins that fight infection. It is common in CLL. IVIG, a drip of antibodies taken from donated blood, is usually considered only when low levels come with repeated or serious infections, not for a low number on its own.
Why CLL lowers antibodies
Antibodies are made by healthy B cells. In CLL, the B cells are the ones that have become cancerous, and they do not make useful antibodies. As CLL cells crowd the marrow and lymph nodes, antibody levels often drift down over the years. Some treatments, especially antibody drips such as rituximab and obinutuzumab, can lower them further.
What the low level does to you
With fewer antibodies, bacterial infections come more often and take longer to clear. Chest infections, sinus infections and ear infections are the usual pattern. Some people notice they need course after course of antibiotics through the year. Doctors sometimes call this hypogammaglobulinaemia, which simply means low antibody levels in the blood.
What IVIG does, and does not do
IVIG tops up the antibodies you are missing, for a few weeks at a time. It does not treat the CLL itself and does not raise your own antibody production. It is a replacement, so it has to be repeated for as long as it is needed.
On your report
What do IgG, IgA and IgM mean on a blood report?
- Immunoglobulins
- Another name for antibodies. The test measures the main types in your blood.
- IgG
- The most plentiful antibody and the one that protects against most bacterial infections. A low IgG is the level most used to judge whether IVIG might help.
- IgA
- Protects the lining of the nose, chest and gut. When low, sinus and gut infections may be more frequent.
- IgM
- The first antibody made when a new infection starts.
- Trough level
- The IgG level measured just before the next IVIG dose. It shows whether the replacement is keeping you protected between doses.
Not sure whether this applies to you?
Ask an oncologistThe options
What can be done about low antibodies in CLL?
IVIG is one of several tools. Your haematologist usually starts with the simpler steps and adds more if infections continue.
Vaccines and everyday precautions
Flu, pneumonia, COVID-19 and non-live shingles vaccines, along with hand washing and early care for fever. These are advised for almost everyone with CLL.
Preventive antibiotics
For some people with frequent chest infections, a regular antibiotic course may be tried first. It is simpler and cheaper, though it does not suit everyone.
IVIG through a drip
Antibodies given into a vein in a day-care chair, usually every few weeks.
Usually considered when
- IgG is low on repeat tests
- Serious or repeated bacterial infections continue
- Vaccines and antibiotics have not been enough
Immunoglobulin under the skin
A smaller amount given more often into the fat under the skin, sometimes at home after training. Availability in India is more limited.
On the day
What happens at an IVIG session?
Checks before starting
Your temperature, blood pressure and pulse are taken. You may have a blood test for kidney function and your IgG level. Tell the nurse if you have had a fever or infection since the last dose.
Starting slowly
A cannula is placed in your arm. The drip starts slowly and is speeded up if you feel well. The first dose is usually given more slowly than later ones.
Being watched
Nurses check you through the drip. Tell them straight away if you get a headache, chills, rash, chest tightness or breathlessness.
Going home
Most people go home the same day. Drink plenty of fluids that evening. A mild headache the next day is common. Call the team if you develop a severe headache, a stiff neck, leg swelling or breathlessness.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Commonly believed
What do families misunderstand about IVIG?
"The report says IgG is low, so we must start IVIG now."
A low level without repeated infections is not usually a reason for IVIG. Many people with low IgG manage well with vaccines, precautions and quick treatment of infections.
"IVIG will treat the CLL."
It has no effect on the CLL cells. It only replaces missing antibodies to reduce infections. CLL treatment is a separate decision, made on its own signs such as falling counts or growing lymph nodes. A person can be on IVIG while still on watch and wait.
"Once started, IVIG is for life."
Not always. Many haematologists review it regularly, and some pause it to see whether infections return. Any change is planned with your team. Do not miss or delay a dose on your own because you have been well, since being well may be the effect of the IVIG.
"After IVIG, I no longer need vaccines or antibiotics."
IVIG lowers the risk but does not remove it. A fever still needs same-day attention, and vaccines are still advised where your team recommends them.
Being straight with you
Who is IVIG not right for, and what can this page not tell you?
IVIG does not suit people whose low IgG causes few or no infections, because the benefit is small and the burden is real. People with a history of severe reactions to blood products, certain kidney problems, or a high risk of blood clots need extra caution. A rare form of IgA deficiency can also raise the risk of reactions, so tell your team about any past reaction.
The practical side
IVIG is made from plasma given by many donors, so supply can be tight and the cost is high. Regular day-care visits take time for you and the family member who comes with you. Check the current rules of Aarogyasri, CGHS, ECHS, EHS, PM-JAY or your insurer, since coverage for immunoglobulin varies and changes.
What this page cannot tell you
It cannot say whether your level is low enough to need IVIG, how often you would need it, or how long for. Those depend on your infection history, your treatment and repeat tests. Keep a simple diary of each infection, the antibiotic used and any hospital visit. It is the most useful thing you can bring to the conversation.
Did you know
Each IVIG dose is made from plasma pooled from many healthy donors, and it is screened and treated to remove viruses. That is why it is given in a monitored setting and recorded carefully, like any other blood product.
Questions we are asked
Common questions about low immunoglobulins and IVIG in CLL
Is a low IgG level dangerous on its own?
A low IgG raises your chance of bacterial infections, but many people with low levels do not get frequent infections. What matters most is your infection history. Your haematologist reads the number alongside how often you have been ill and how serious those infections were.
How often is IVIG given?
It is usually given as a drip every few weeks. The exact gap and amount are set by your haematologist, based on your weight, trough IgG level and how well infections are controlled. The schedule may be adjusted over time, so do not compare yours with someone else's.
What side effects can IVIG cause?
Headache, tiredness, chills, a flu-like feeling or mild fever during or after the drip are the common ones. Rarely, it can cause an allergic reaction, kidney strain or a blood clot. Tell the team about any reaction, because the drip speed or preparation can often be changed.
Can IVIG be given during CLL treatment?
Yes. IVIG can be given before, during or after CLL treatment if infections are a problem. It does not interfere with the way CLL medicines work. Your team will schedule it around your other appointments where possible.
How will we know if IVIG is working?
The main sign is fewer and milder infections, with fewer antibiotic courses and hospital visits. Trough IgG levels are also checked. Keeping an infection diary before and after starting makes it much easier to see the difference.
Is IVIG safe, since it comes from donated blood?
Donors are screened, and the product goes through steps that remove or inactivate viruses. Serious infection from IVIG is now very rare. Ask your team to explain the product being used and sign the consent only when your questions are answered.
Can my own antibody levels come back up?
Sometimes they improve a little after effective CLL treatment, but in many people they stay low. Your haematologist may recheck levels over time, especially if IVIG is paused, to see whether you still need it.
Is there a natural way to raise immunoglobulins?
No diet, supplement or herbal remedy has been shown to raise antibody levels in CLL. Some products may interact with your CLL medicines. Good food, sleep and activity support general health, but they do not replace the steps your team recommends.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Sources
- Leukaemia & Lymphoma Society — Chronic lymphocytic leukemia
- Blood Cancer UK — Chronic lymphocytic leukaemia (CLL)
- National Cancer Institute — Chronic Lymphocytic Leukemia Treatment (PDQ) - Patient Version
- NHS — Chronic lymphocytic leukaemia
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Talk to us
Getting infection after infection with CLL?
Share your reports and infection history with us. CION's haematology team will review whether more protection is needed. One helpline serves every CION centre.