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

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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. ...Read more

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


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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. ...Read more

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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. ...Read more

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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. ...Read more

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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. ...Read more

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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. ...Read more

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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. ...Read more

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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, . ...Read more

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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. ...Read more

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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. ...Read more

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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. ...Read more

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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. ...Read more

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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. ...Read more

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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. ...Read more

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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 ...Read more

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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. ...Read more

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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. ...Read more

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What could be causes of a react lympth number of 12 in a CBC Differential blood test?

What could be causes of a react lympth number of 12 in a CBC Differential blood test?

Could be signs of: A recent viral infection. I need more clinical information to speculate any further. ...Read more

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I had a blood test done called cbc and my platlets were high 499 and it said stable, what does this mean?

Need more info: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, it would have helped to have all the results. High platelet count is often associated with iron deficiency. Please discuss the results with your doctor as the high count may predispose you to blood clots. ...Read more

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Blood test a couple years ago had glucose at 68, this year's CBC glucose was 99. Both are fasting. Should there be a concern?

Blood test a couple years ago had glucose at 68, this year's CBC glucose was 99. Both are fasting. Should there be a concern?

Not yet...: Any fasting blood sugar below 100 is technically normal, but your number did go up pretty quickly. Tweak your diet and exercise regimen to get that number back down. ...Read more

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Male, age 23, Indian. On a Blood Test (CBC) all components are within Normal Range except for "MONOCYTES which are 01%". Anything to worry??

Male, age 23, Indian. On a Blood Test (CBC) all components are within Normal Range except for "MONOCYTES which are 01%". Anything to worry??

No: Certain bone marrow abnormalities & large number of infections have been associated with monocytosis including brucellosis, varicella-zoster, bacterial endocarditis, tuberculosis, malaria, typhoid fever, syphilis, and trypanosomiasis. An abnormal WBC & other cell count are associated with these conditions. An isolated increase monocyte count is non-specific finding without any significance ...Read more

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Difference between CBC and FBC blood test?

Difference between CBC and FBC blood test?

CBC and FBC,: complete blood count and full blood count, are two terms for the same test. ...Read more

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Could not eating for a few days mess up a CBC differential blood test?

Could not eating for a few days mess up a CBC differential blood test?

No: It should not affect your test result significantly.

http://www. Mayoclinic. Org/tests-procedures/complete-blood-count/details/how-you-prepare/ppc-20257182 ...Read more

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Can you explain if it's possible to have mono with a normal CBC blood test?

Can you explain if it's possible to have mono with a normal CBC blood test?

Yes it is possible: The best way to determine if you have mono is to do a monospot test or do a blood test for the epstein barr virus igm titer. If positive it would tell you that you have mononucleosis. ...Read more

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If you do a blood test and the doctors say they see a little suger in your blood...Does that mean I have diabetes? It was a CBC I did...

Ask 4 clarification: Sugar in the blood could mean pre or borderline diabetes (fasting blood sugar 100-125 mg/dl) or diabetes (equal or more than 126 mg/dl). Cbc is complete blood count and won't show blood sugar count. Take care! ...Read more

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I am a 66 yr old male and my blood test show a RDW-SD of 47.8fl and a RBC of 4.62mil All other CBC readings were normal. Is this a problem?

I am a 66 yr old male and my blood test show a RDW-SD of 47.8fl and a RBC of 4.62mil All other CBC readings were normal. Is this a problem?

No: I would check your stool for occult blood in case this is very early iron deficiency perhaps due to a bleeding ulcer or tumor ...Read more

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I ate an egg on 1/2 an English muffin 2 hrs before a blood test (didn't know before). My dr knows, says it's ok, but how can it affect CBC results?

Does not: Eating what you did, does not affect CBC results.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex. ...Read more

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Can my thyroid blood test also come with a cbc?

Can my thyroid blood test also come with a cbc?

No: These blood tests are run from different types of collection tubes. They would have also had to have drawn a tube with a purple top to do the cbc. ...Read more

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I had a blood test CBC 449 high platlets and stable, and have been feeling dizzy for 4 days, what does this mean?

Need more info: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, high platelet count may be due to iron deficiency. You should discuss all of your blood test results with the doctor who ordered the test.
Drink enough water so that your urine is colorless.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex. ...Read more

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Could you please tell me what blood test are used for lupus. I'm looking at blood test example CBC =blood count. Lupus=?

Could you please tell me what blood test are used for lupus. I'm looking at blood test example CBC =blood count. Lupus=?

Lupus blood tests: Have your physician order an ANA test. If that is positive, seek the care of a rheumatologist. For further tests. Patients with lupus are anemic, usually. ...Read more

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Incorrect blood test results? 2 drs request blood. Blood taken for both at the exact same time in same lab. Cbc results very different. What to do?

Incorrect blood test results? 2 drs request blood. Blood taken for both at the exact same time in same lab. Cbc results very different. What to do?

CONFUSION: Many things may have happened including the lab mixing up your results and someone elses. Have the drs question the lab and find out. Or repeat the tests.
Our civilization has many confusions that you just have to straighten out. ...Read more

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What if you took a blood test and something was wrong? How long will you know or will you get a call immediately. It been 24 hrs so far 4 CBC lipid p

What if you took a blood test and something was wrong? How long will you know or will you get a call immediately. It been 24 hrs so far 4 CBC lipid p

Don't worry: Your doctor's office have a protocol in notifying their patients of results. Being young most likely yor results will be normal. Some doctors will notify you by phone of the results after the doctor reviews the results and sign off on them. Some may send you an e mail which immediate. Some may send you a letter which may take a week. If you have an abnormal test they will give you instruction ...Read more

Dr. Donald Alves
356 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