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A 38-year-old member asked:

brown stringy blood on one side of tampon two weeks before expected period?

1 doctor answer1 doctor weighed in
Dr. Karen Jones
Obstetrics and Gynecology 37 years experience
Midcycle spotting: Some women will spot for 1-2 days about 2 weeks before the next period is due. This is usually caused by the hormone changes of ovulation, and more often happens to women in late 30's or 40's. Other possibilities are cervical infection, cervical or uterine polyps, for instance, though bleeding from those causes can occur at any time in the cycle.

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A 45-year-old member asked:

What is a blood group?

2 doctor answers3 doctors weighed in
Dr. Carolyn Thompson
Obstetrics and Gynecology 28 years experience
Blood type: "blood group" and "blood type" are the same thing. Blood types are as follows: a, b, o, and ab. There is also the rh factor, which is + or -. Blood types are inherited traits. Worldwide, o+ is the most common type, and ab- is the rarest type.
A 33-year-old member asked:

What's the biggest blood group in the world?

1 doctor answer1 doctor weighed in
Dr. Michael McGonigal
General Surgery 39 years experience
O+ is most common: O positive is the most common worldwide. The rarest is ab-.
A 32-year-old member asked:

Can your blood group affect your health?

1 doctor answer1 doctor weighed in
Dr. Nasfat Shehadeh
Hematology and Oncology 29 years experience
No: No.
A 37-year-old member asked:

Does "sc blood group" exist?

1 doctor answer1 doctor weighed in
Dr. Mehdi Moezi
Medical Oncology 31 years experience
SC Hemmoglobin: Yes it is not a blood group you may mean sc disease which is hemoglobinopathy and combination of sickcle and hemoglobin c and may need treatment an dhematology observation. Ask for referral to hematology.
A 33-year-old member asked:

How could blood groups originate?

1 doctor answer2 doctors weighed in
Dr. Ed Friedlander
Pathology 44 years experience
Genetic drift: There is no obvious selective advantage for A, B or O in nature, and these seem to be the result of random mutations. Some of the African blood groups, famously Duffy Negative, arise in response to selective pressure because it gives immunity to the local form of malaria. You may find this site helpful http://sandwalk.blogspot.com/2007/02/abo-blood-types.html

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Last updated Nov 30, 2020

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