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Doctor insights on: Does Donating Blood Interfere With A Cbc Blood Test

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Dr. Gurmukh Singh Dr. Singh
Pathology
45 years in practice
University of Pune, Armed Forces Medical College
1

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I regularly donate blood every 2 months. Would this affect blood test results and so which ones? CBC? LFT? CMP? Tbili?

I regularly donate blood every 2 months. Would this affect blood test results and so which ones? CBC? LFT? CMP? Tbili?

Iron: Serum iron and ferritin levels are likely to be affected before any other test results. Do not wait for hemoglobin to drop. If you donate blood regularly, it would be a good idea to take oral iron supplements.

Complete Blood Count (Definition)

Share on twitter bookmark & share printer-friendly version a complete blood count (CBC) test measures the following: •the number of red blood cells (rbc count) •the number of white blood cells (wbc count) •the total amount of hemoglobin in the blood •the fraction of the blood composed of ...Read more


Dr. Sewa Legha Dr. Legha
Internal Medicine - Oncology
46 years in practice
Punjab University, Christian Medical College
2

2
Can a CBC (blood test) show leukemia always?

Can a CBC (blood test) show leukemia always?

Yes, most times: A leukemia typically begins in the bone marrow and will often show effects on the CBC as the cancer cells spill over into the circulating blood. On rare occasions leukemia may be still limited in the bone marrow, so we make a diagnosis by taking a bone marrow sample.

Dr. Agos Luca Dr. Luca
Pathology
years in practice
Institute of Medicine and Pharmacy in Tirgu-Mures
3

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Could a CBC (blood test) show leukemia accurately always?

Could a CBC (blood test) show leukemia accurately always?

Sometimes: Sometimes but not always. Leukemia, a form of blood and bone marrow cancer, is frequently detectable in the blood; however, especially if early in the course of the disease, leukemic cells may be confined to the bone marrow and not cross into the blood in sufficient numbers to be detected by a cbc. Ultimately, the complete diagnosis and prognosis of leukemia relies on bone marrow examination.

Dr. Eugene Yang Dr. Yang
Internal Medicine - Cardiology
20 years in practice
University of Pennsylvania School of Medicine
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Dr. Gurmukh Singh Dr. Singh
Pathology
45 years in practice
University of Pune, Armed Forces Medical College
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What does a left shift mean on a CBC blood test?

What does a left shift mean on a CBC blood test?

Usually infection: Left shift means slightly pre-mature leukocytes in circulation which is usually due to infection.

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Dr. Donald Jacobson Dr. Jacobson
Psychiatry
36 years in practice
Vanderbilt University School of Medicine
6

6
Can a CBC blood test show mental disorders?

Can a CBC blood test show mental disorders?

Alcoholism: The CBC can give a strong hint of alcoholism, but sometimes that turns out to be a vitamin b 12 or Folic Acid deficiency.

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Dr. Jasyn Haney Dr. Haney
Family Medicine
20 years in practice
University of North Texas Health Science Center at Fort Worth Texas College of Osteopathic Medicine
7

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If someone had later stage cancers would a CBC blood test be normal?

If someone had later stage cancers would a CBC blood test be normal?

Possibly: Honestly, it would depend on the specific cancer and where and if it has spread to other sites. For instance, melanoma would likely have a normal count but leukemia would not.

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Dr. Kathy Robinson Dr. Robinson
Family Medicine
28 years in practice
University of North Carolina School of Medicine
8

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Finished amoxicillin 24 hours before a cbc blood test. Would it have affected it?

No: If you had an infection, then taking the antibiotic may help by clearing the infection and this would decrease your WBC count. It would have no effect on other measures in the CBC.

Dr. Michael Dugan Dr. Dugan
Internal Medicine - Hematology
years in practice
Indiana University School of Medicine
9

9
Can a CBC blood test detect hypothyroidism?

Can a CBC blood test detect hypothyroidism?

No: You need specific tests of thyroid function. Generally a T4 and tsh.

Dr. Liawaty Ho Dr. Ho
Internal Medicine - Hematology & Oncology
19 years in practice
Udayana University Faculty of Medicine
10

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How can a CBC blood test show signs of cancer?

How can a CBC blood test show signs of cancer?

Cbc: Yes, there are some abnormal features that you can see in CBC (and peripheral blood smears) that would increase your suspicion towards certain blood cancer-for instance- circulating blast cells (immature white blood cells) in acute leukemia, and other features that you can see in chronic leukemia- i.e. Cml, cll. You can not see any sign of solid cancer from cbc, however, .

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Dr. Steven Hebert Dr. Hebert
Pathology
25 years in practice
Louisiana State University School of Medicine in Shreveport
11

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Does a CBC blood test detect cancer? Specifically lymphoma?

CBC & Lymphoma: There are a few lymphomas which can be detected on a CBC but most will not show up that way. In other words, if your CBC is normal doesn't mean you don't have lymphoma. A biopsy of any enlarged lymph node is suggested.

Dr. Elizabeth Wallen Dr. Wallen
Pediatrics
31 years in practice
The Wright State University Boonshoft School of Medicine
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I made a CBC blood test and my eos% is 6% and normal ranges is from 0.5 - 5.0 % what is that mean is that a sign of a serious disease?

I made a CBC blood test and my eos% is 6% and normal ranges is from 0.5 - 5.0 % what is that mean is that a sign of a serious disease?

No it's fine.: There is a lot of variability in ranges from lab to lab and blood draw to blood draw. I would call that normal. If we drew your blood again, chances are it would be in the range. Nothing to worry about. You see bumps in eos (short for eosinophils) in allergies, eczema and if you are certain medications. All good.

Dr. Ed Friedlander Dr. Friedlander
Pathology
40 years in practice
Northwestern University Feinberg School of Medicine
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I got a CBC blood test and my lymphocytes reading was 45.5% and was flagged high...Normal said 42%. Everything else was normal. Is this bad.

I got a CBC blood test and my lymphocytes reading was 45.5% and was flagged high...Normal said 42%. Everything else was normal. Is this bad.

Absolute count?: These percentages mean nothing whatever apart from the total number of lymphocytes and the total number of neutrophils. If both are in the reference range or fairly close, this is not a cause for concern.

Dr. Romanth Waghmarae Dr. Waghmarae
Pain Management
35 years in practice
Faculty of Health Sciences of the University of the Witwatersrand
14

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Would heart diease show up on a CBC blood test or blood count

Would heart diease show up on a CBC blood test or blood count

Heart disease: Cbc/blood count is not really specific. One may see evidence of chronic issues, chronic infection etc... This will not be specific for heart disease.

Dr. Corey Clay Dr. Clay
Internal Medicine - Allergy & Immunology
6 years in practice
The Ohio State University College of Medicine
15

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Hownlong does alcohol and tobacco stay in the body for a cbc blood test and a normal urine test?

Hownlong does alcohol and tobacco stay in the body for a cbc blood test and a normal urine test?

No matter: Normal urine test and CBC testing would be unaffected by alcohol/nicotine content. Furthermore, they will not show up on these tests. If you are being tested for alcohol or nicotine, then that is a different answer.

Dr. Charles Cattano Dr. Cattano
Internal Medicine - Gastroenterology
35 years in practice
State University of New York Upstate Medical University
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Dr. Brian Clear Dr. Clear
Family Medicine
8 years in practice
American University of the Caribbean
17

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My father (65 yrs old)did a CBC blood test and all results are normal except for the hemoglobin is below normal 11.5 and the RDW is above normal 16.5

My father (65 yrs old)did a CBC blood test and all results are normal except for the hemoglobin is below normal 11.5 and the RDW is above normal 16.5

Anemia: Anemia (low hemoglobin or hematocrit) is never normal, and it is important to find and correct the cause. There are many potential causes though and further blood tests, likely also a stool test or colonoscopy, are next steps to figure this out.

Dr. Creighton Wright Dr. Wright
Surgery
52 years in practice
Duke University School of Medicine
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Will a CBC blood test show internal bleeding or blood clots?

Will a CBC blood test show internal bleeding or blood clots?

No: A low hematocrit or hemoglobin on a cbc requires investigation, which can include internal bleeding as a cause. Multiple other causes as well: cancer, congenital, poor marrow etc. Other tests can discern clotting disorders

Dr. Ed Friedlander Dr. Friedlander
Pathology
40 years in practice
Northwestern University Feinberg School of Medicine
19

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I got a CBC blood test and my lymphocytes reading was 45.5% and was flagged high...and my leucocytes 3.67 was flagged low.

Is that all?: These values fluctuate wildly and if both absolute lymphocyte and absolute neutrophil counts are reasonably close to the normal range, and all else is good, I'd ignore it.

Dr. Eric Chevlen Dr. Chevlen
Internal Medicine - Oncology
43 years in practice
The Ohio State University College of Medicine
20

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Can a CBC with differential blood test determine if a person has ebola?

Can a CBC with differential blood test determine if a person has ebola?

No: That test gives no specific information concerning Ebola, but may be abnormal in a host of different illnesses.

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Dr. Donald Alves
352 Doctors shared insights

Blood Donation (Definition)

Blood donation is the act of giving ones blood to a blood bank, so that it may be used in the future to help someone else. People with transmissible viral diseases, such as HIV or hepatitis C, are not able to donate blood, as ...Read more


Cbc (Definition)

CBC stands for complete blood count. This is a lab test that counts the different formed elements- red and white ...Read more