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Doctor insights on: What Is The Result Of Blood Culture In Sepsis

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If a patient has suspected sepsis and urgent blood cultures are attempted then, approximately, how quickly could it be established that the results are negative.

If a patient has suspected sepsis and urgent blood cultures are attempted then, approximately, how quickly could it be established that the results are negative.

Sepsis: Blood culture often turns positive within 24 hours, however, sometimes it may take longer and other times the blood culture may be negative even though the patient has all the clinical features of sepsis ...Read more

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Dr. Al Hegab
97 doctors shared insights

Blood Culture (Definition)

Blood cultures refers to taking a sample of blood and growing in the microbiology laboratory for invasive organisms. Typically blood cultures are used for bacteria but can also be used to try and identify fungal organisms in ...Read more


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I am in hospital w/a "gram+ bacillus" sepsis..6/8 blood culture bottles are +. Caused by a dirty cut then severe cellulitis. I have heart vegetation from it they say. Also on CellCept. Can you educate me on whats the significance of heart vegetation?

I am in hospital w/a "gram+ bacillus" sepsis..6/8 blood culture bottles are +. Caused by a dirty cut then severe cellulitis. I have heart vegetation from it they say. Also on CellCept. Can you educate me on whats the significance of heart vegetation?

Endocarditis. : What you describe is endocarditis. The vegetations harbor the bacteria that are identified when blood cultures are obtained. Sepsis, heart failure as well as "septic emboli" are potential complications 6 weeks of IV antibiotics followed by repeat blood cultures and follow up echocardiogram to insure treatment was adequate. ...Read more

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Could a urine m/c/s identify a particular infection that two blood cultures may fail to identify in a case of suspected sepsis. Is this very unlikely?

Could a urine m/c/s identify a particular infection that two blood cultures may fail to identify in a case of suspected sepsis. Is this very unlikely?

If the source of the: sepsis is the urinary tract (kidneys and bladder primarily), then urine c/s might identify the cause of sepsis and the best antibiotic to treat it. Kidney infection is a common cause of sepsis in certain groups of people. If the source of the infection is elsewhere, then urine c/s won't identify the cause unless the sepsis has spread from the bloodstream to the kidneys. Dr. Anne ...Read more

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If blood cultures are taken because there is a suspicion of sepsis, does it particularly matter if urine cultures are not also taken? Why?

If blood cultures are taken because there is a suspicion of sepsis, does it particularly matter if urine cultures are not also taken? Why?

Blood cultures: Sepsis is a condition where a local infection has spread to the bloodstream; the process does not normally show any telltale signs in the urine UNLESS the source of the infection is suspected to be the bladder or the kidney. However, statistically, at your age, infection in the genitourinaty tract is often the most likely source, so, if that is suspected, a urine sample is indicated to confirm. ...Read more

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Blood culture and how long till results?

Blood culture and how long till results?

2-3 days: Usually bacterial blood cultures take 2 days to grow and the results should be out by 3 days. If they are looking for fungus or viruses on the culture then it could take longer depending on th institution and if the test is being sent to another facility. ...Read more

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How many days does it take to get blood culture results of a breast abscess?

How many days does it take to get blood culture results of a breast abscess?

Varirs: Ideally the result of a culture would come back in a couple days. In reality the full culture and antibiotic sensitivity may take 5-7 days to come back. Blood cultures results may take longer than direct abscess fluid culture from the breast itself too. ...Read more

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How fast can infection show up in a blood culture? (I was called back in about 12 hrs to come back in due to positive result)

How fast can infection show up in a blood culture? (I was called back in about 12 hrs to come back in due to positive result)

Under 12h, obviously: Obviously it can show up in under 12 hours; they wouldn't have called you back if the test were not definitely positive. The fast result could suggest a particularly dangerous infection: virulent bacteria often are detected rapidly, and it also may mean large numbers of bacteria in the blood. This could be very serious; get back to the doctor IMMEDIATELY. Good luck! ...Read more

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Hi doctor, my brother blood first report and final report got Negative result. my question is blood culture result should come positive or negative ?

Hi doctor, my brother blood first report and final report got Negative result. my question is blood culture result should  come positive or negative ?

No should on testing: There is no should. The results are either yes or no. When a patient us severely ill, or has sepsis, treatment often starts before culture results are known. It appears there is much more to your story and this app cannot answer anything specific about the situation you are facing. Your concerns should be addressed by the professional responsible for this care there at the hospital. ...Read more

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How long does it take to get blood culture results?

How long does it take to get blood culture results?

Depends: Routine blood cultures are usually read at 24 and 48 hours and then again at 7 days and 14 days depending upon the organisms that are growing. Newer "blood culture" results using a variety of methods including dna testing or radioactive metabolite detection can often be read much sooner- in hours. ...Read more

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How long does it normally take to get blood culture results back?

How long does it normally take to get blood culture results back?

1-5 days: It can be as soon as one day but labs will usually incubate and monitor the cultures for up to 5 days to make sure nothing is growing. ...Read more

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CT result-Thorax extensive mediastinal lympopathy with central caseating ,TB lymphopathy to consider skin,blood culture negative it is TB disease?

CT result-Thorax extensive mediastinal lympopathy with central caseating ,TB lymphopathy to consider skin,blood culture negative it is TB disease?

Caseating granulomas: This sounds like tuberculosis, but may conceivably be systemic fungal infection like Histoplasmosis, rarely lymphoma or sarcoidosis. In India this is probably TB and either should be treated empirically or wait for the results of the biopsied lymph nodes. Sounds as if your doctor is very astute and would heed their advice. Best wishes. ...Read more

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What exactly is a CSF culture & what is its purpose? Is it difficult to perform and does it take longer than blood cultures for a result to come back?

Similar to blood: A CSF culture is when you take a sample of CSF (usually from a lumbar puncture which samples the CSF from the spinal canal in the lower back - so yes a bit more difficult to perform but still pretty routine) and culture it to see if there are bacteria (or sometimes viruses) growing in it, usually to look for meningitis. It takes the same amount of time as a blood culture (48 hours). ...Read more

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Can you think of any reason why blood cultures would come back with negative results within 2 hours even though antibiotics not commenced until hours after the results have come back.

Can you think of any reason why blood cultures would come back with negative results within 2 hours even though antibiotics not commenced until hours after the results have come back.

Unclear question: If the blood culture results were reported within 2 hours, then it could not have bee culture, as that takes at least 24 hours, longer depending on the type of organism and microbial load. It was probably some other test like CRP, not blood culture, that was reported within two hours of blood collection. It may help to talk to the pathologist in-charge of the laboratory. ...Read more

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I understand it can take a few days for the results of blood cultures to be known Generally, is it any quicker to get the results of urine cultures?

May be: Significant bacterial infection of the urinary tract will show up positive in about 24 hours. However additional identification of the organism and antibiotic sensitivity may take another day or two. ...Read more

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Blood cultures done for swollen fingers/neck pain. 2 cultures drawn same site. Results " growth of coagulase negative staph" dr. Says contaminated? ?

Second opinion: Any thing is possible. If done by your family physician or specialist ask for another specimen to culture. If truly contaminated then procedure was not done with sterile technique. ...Read more

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Had sepsis, blood in urine, urobilinogen level went from .2 to 2 in 2 hours. Dx of UTI, but urine culture came back negative. Any other ideas for dx?

Too complicated: There are too many possibilities and this sort of problem is too dangerous for an opinion on a forum like this. You'll have to keep working with the doctor responsible for your care. Good luck! ...Read more

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What is the definition or description of: blood culture?

Blood cultures: Blood cultures refers to taking a sample of blood and growing in the microbiology laboratory for invasive organisms. Typically blood cultures are used for bacteria but can also be used to try and identify fungal organisms in the blood like yeast. ...Read more

Dr. William Walsh
439 doctors shared insights

Septic Shock (Definition)

Septic shock. Sepsis occurs when an infections enters & is spread through the bloodstream, potentially causing a marked drop in blood pressure with potential for stroke, heart or ...Read more


Dr. William Walsh
1,880 doctors shared insights

Sepsis (Definition)

The body's abnormal response to severe infection. Sepsis symptoms include fever, rapid heart rate and rapid breathing, and bloodwork will reveal elevation of ...Read more