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My WBC counts are falling down. What is the reason?

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The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Medically reviewed by

Dr. K. Shobana

Published At July 9, 2018
Reviewed AtJanuary 18, 2024

Patient's Query

Hi doctor,

I am concerned about my low and falling WBC count recently. I do not have any chronic diseases. My doctor says, it is vitamin B12 deficiency and the doctor has prescribed vitamin B12 to take 1000 mg per day. My mother had MDS, diagnosed two years back and expired from it. My WBC counts recently in the past three months were 3.23 K/mcL, 3.13 K/mcL, 4.50-11.00 K/mcL, respectively.

Hi,

Welcome to icliniq.com.

I can understand your worries. First, it is of utmost importance to have a glass slide reviewed by a hematologist to check for the morphologic abnormalities, that is the dysplastic features of the cells. Not only it depends on the count, but also on the appearance of the cells that give the diagnosis of myelodysplasia. In your case, none of the absolute values of neutrophils, Hb or platelets qualifies for meeting the threshold criterion for MDS (myelodysplastic syndromes) (attachment removed to protect patient identity). These are called prerequisite criteria and they are Hb less than 110 g/L, neutrophils less than 1.5 g/L and for platelets less than 100 g/L. A glass slide review will also cover if any abnormal cells are present. If there are dysplastic features and abnormal cells present then, a further diagnostic workup is definitely needed. In your case, the prerequisite criteria are not met. If a glass slide has not been reviewed, I suggest to do it once.

Secondly, it is important to check for hematinic deficiencies such as vitamin B 12, folic acid, and iron. You have your serum levels of folic acid checked, because you may be deficient, since, the folic acid normally does not have proper stores in the body. Your vitamin B12 is close to the lower limit, which means that there might be a functional deficiency, causing megaloblastic changes in the bone marrow and this may be the reason behind the low neutrophil counts. Consider intake of any medications, that may cause suppression of bone marrow. Non-steroidal anti-inflammatory agents and Paracetamol are the reason behind the low count of neutrophils. I would consider these points before taking diagnostic work up to MDS.

Patient's Query

Thank you doctor,

My doctor has done a morphology review. I was not able to get the full report but, here is the pathologist comment given below. I think it looks fine. They have not mentioned the abnormalities. Pathologist blood smear consult comment: Leukopenia with occasional reactive appearing lymphocytes, ruled out viral or other infection, drug or alcohol effect, an autoimmune process.

Hi,

Welcome back to icliniq.com.

Yes, the report says that there are no abnormal cells like blast cell as well as dysplastic features. The report describes a finding regarding the lymphocytes (these are white blood cells which are produced by the immune system and not by the bone marrow) that they are reactive. This means that they have a more abundant appearance which can be present when they are active and trying to produce antibodies. This does not imply an infectious state.

Normally, our body gets in contact with many foreign particles with which they struggle to prevent them from entering into the body. Usually, when this process functions properly, no disease develops. These reactive lymphocytes are the sign that the immune system is competent and active. Sometimes, they indicate an overactive immune system, therefore the pathologist is supposed to check for viral infection or autoimmune state. But, if you have no concomitant complaints, I would suggest that this is just a normal reactivity and I will advise you to go for checking folic acid and iron.

Patient's Query

Hello doctor,

Thank you for the reply.

Just wanted to follow up with you and have your feedback. So I have been taking B12 for the last two weeks and I had my doctor's appointment and CBC test yesterday.

The WBC count increased to 3.30 from 3.13 (two weeks back) but Neutrophils went down to 1.62 from 1.76.

My doctor did not tell me much, he said that it does not look good and has asked for a bone marrow biopsy. I am really nervous. I have attached the latest report and all my historical CBCs.

Let me know what you think. Any feedback would be helpful.

Thanks.

Hi,

Welcome back to icliniq.com.

Vitamin B12 is responsible for normal division of cells. When it is not sufficient something like a "stop", an arrest in normal cellular division occurs, i.e. cells are frozen at a certain stage of their development. However, since it normally takes time for a cell to undergo division and produce offspring when therapy with vitamin B12 is initiated something like a time lag occurs between when the hungered cell takes up the vitamin, and real production of cells is put in motion. This is because DNA (deoxyribonucleic acid) synthesis for which vitamin B12 is responsible takes time. So, if there is a patient with vitamin B12 deficiency anemia, usually a paradoxical drop in hemoglobin is observed before a real steady increase in hemoglobin levels is seen. Then, I suppose the same paradoxical drop of counts should be applicable to other cell lines, such as neutrophils because their production is also dependent on vitamin B12 by the same mechanism. Try taking vitamin B12 for 21 days in total; have your reticulocytes checked right away - they will show how well actually bone marrow responds. If they are increased, that is very good. If they are not increased, either your bone marrow does not need B12 or/and the reason for low neutrophils might be something else. 21 days is optimal for testing vitamin B12 deficiency state, i.e. if a deficiency is indeed present. Then, if there is no response, it is fine to undergo a bone marrow examination. I would only advise allowing at least 10 days between the end of vitB12 and the test itself because vitamin B12 alters the morphological picture since it stimulates cells and in order to have an objective picture of bone marrow, vitamin B12's effects need to wane at first.

Patient's Query

Hi doctor,

Thank you for the reply.

Your suggestion saved me money and pain for me. Based on your suggestion yesterday, I called up my doctor and asked him to hold off biopsy for some more time until vitamin B12 takes some action. He was a bit reluctant to postpone the biopsy but then said if I am saying so, let us get another CBC yesterday evening, and based on the CBC results, let's decide on a biopsy. And guess what, my CBC result came back with 4.7 WBC (it was 3.3 last Monday) and 3.07 neutrophils (it was 1.6 last Monday). All perfectly normal. So vitamin B12 did take time to kick in but it finally did so no more biopsy and other worries. I am so relieved. I cannot thank you enough. Attached latest report please check it.

Hi,

Welcome back to icliniq.com.

I am more than happy to know that things turned out successfully for you. It is very motivating for me as well.

I would suggest that you finish the 21-day treatment course with vitamin B12, but no more. Usually, the treatment scheme for vitamin B12 deficiency is very aggressive, but I do not think that you should undergo that since your levels were close to normal. After you finish the 21-day schedule, you can have one shot after 15 days, then one month afterward, then one shot after three months, and finally six months after the previous shot. Then stop. I can also suggest that you do a gastroscopy to check for the possible gastric reasons for the malabsorption of vitamin B12. Keep in mind that after several weeks of vitamin B12 treatment iron deficiency might develop, as well as folic acid deficiency. This is because they altogether are used for hematopoiesis. So, it is good to have serum iron and ferritin checked and start a short course of prophylactic iron if deficiency is present. Folic acid needs not to be checked by a blood test. You can just start taking the oral supplement for a month. Because even if it is not deficient, it does no harm at all.

I think this is sufficient and you can relax now. You can have your CBC (complete blood count) every six months to follow up counts, but more often than that is not necessary.

Kind regards.

Treatment plan

Tablet Folic acid 5 mg orally daily for 15 days.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Elina Angelova Beleva
Dr. Elina Angelova Beleva

Hematology

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