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Doctor insights on: How Quickly Can Antibiotics Affect A Blood Test

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Dr. John Leander Po
1,117 doctors shared insights

Antibiotic (Definition)

An antibiotic is a medicine that slows, stops, or kills germs. The germs are usually bacteria causing an infection in a person, so the person uses antibiotics to help his body get ...Read more


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Will my antibiotic alprim show up on a blood test? If so how long until it is out of my system?

Will my antibiotic alprim show up on a blood test? If so how long until it is out of my system?

No: Alprim is a sulfa antibiotic. I have done drug screening for twenty years and I am unaware of sulfa antibitotics having any cross reactivity with drug tests. Make sure you let the testes know you are or have recently taken the test. ...Read more

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Blood test in 2 days to check for infection, but still have a days dose of antibiotics left. Do I take them? Will it affect results?

Blood test in 2 days to check for infection, but still have a days dose of antibiotics left. Do I take them? Will it affect results?

Complete the plan: Yes, please finish your antibiotics as prescribed. They work much better when you use them as planned.

The test may be affected only if the antibiotics did not do their job. If you do not take them, they probably will not do a very good job.

Hope that helps! ...Read more

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Bad headaches for several weeks (antibiotics haven't worked) and lump behind ear, near hairline (firm but moves) on blood test white blood high?

Bad headaches for several weeks (antibiotics haven't worked) and lump behind ear, near hairline (firm but moves) on blood test white blood high?

Different antibiotic: You may need a different antibiotic because fever, high white cell count, and severe persistent headache suggest an infection. You should see someone as soon as possible because the infection can potentially spread to the brain. ...Read more

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Can my baby do blood test for liver when he is on antibiotics?

Can my baby do blood test for liver when he is on antibiotics?

Why not: You can check blood any time, but is it necessary? Why do you want to check blood for your baby? Does his pediatrician order it? ...Read more

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Can l have my regular blood test done if l am on antibiotics about skin infection. Thanks?

Can l have my regular blood test done if l am on antibiotics about skin infection. Thanks?

Depends....: It all depends on what your "regular blood test" is whether it could be affected by being on antibiotics. If in question, ask the health care provider who orders your regular blood test or the one prescribing the antibiotics. ...Read more

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Blood test came back h pylori positive. Doc has me on 2 antibiotics. How effective are the antibiotics against h pylori? I'm 28, male.

Blood test came back h pylori positive. Doc has me on 2 antibiotics. How effective are the antibiotics against h pylori? I'm 28, male.

+ PPI?: 2 antibiotics plus a ppi drug like Omeprazole work about 85% of fhe time. Blood test means past exposure, not necessarily current infection. Breath or stool test can tell if infected, or cured. Will need to be off ppi and antibiotics for 4-6 weeks to tell. ...Read more

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I have been treated for chlamydia after showing positive in blood test. I've taken the two tablets of antibiotics should it be clear now?

Chlamydia: What was the antibiotic. Chlamydia can be treated with a single dose of azithromycin, or 7 day (sometimes 10 day)_treatment with Doxycycline or erythromycin. You need to ensure that you aren't sexually active for at least 7 days and that you don't become re-infected. ...Read more

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Can you tell me if someone had a blood test for h. Pylori and scored 1.02 out of a possible 0-99 should this person be treated with antibiotics?

Can you tell me if someone had a blood test for h. Pylori and scored 1.02 out of a possible 0-99 should this person be treated with antibiotics?

What for?: 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, from the information you provided it is not feasible to know if the person has any disease. What would you expect the antibiotics to do? ...Read more

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2 years ago I ate a few ful packets of antibiotics for a suicide atempt. Recently after a blood test my liver enzyme level came back high. Am i at risk?

2 years ago I ate a few ful packets of antibiotics for a suicide atempt. Recently after a blood test my liver enzyme level came back high. Am i at risk?

Risk for what?: It means u have to avoid alcohol, since it can increase u liver function test and not to take any medication without discussing it with u physician. ...Read more

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My baby have high sgot191.8u/l, sgpt189.5u/l, GGT 278u/l n birilubin5.2umol/l. He is on antibiotic when do the blood test. Didmy baby have liver disease?

My baby have high sgot191.8u/l, sgpt189.5u/l, GGT 278u/l n birilubin5.2umol/l. He is on antibiotic when do the blood test. Didmy baby have liver disease?

Abnormal liver tests: The numbers you gave show your baby has elevated liver enzymes and high bilirubin level. There are many reasons why these are high. If your baby is on an antibiotic for infection the infection — if serious — could be causing the liver to be inflamed and cause the higher numbers. Your baby's doctors can do other tests to see if the liver is having problems. ...Read more

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What is the definitive blood test for spinal meningitis. If it's spread to tissue how is it best treated? Can it be treated with oral antibiotics?

What is the definitive blood test for spinal meningitis. If it's spread to tissue how is it best treated? Can it be treated with oral antibiotics?

None/No: There is no blood test that proves meningitis. Lumbar puncture and spinal fluid examination, pcr's and culture are the definitive tests for meningitis. Bacterial meningitis is treated with high dose intravenous antibiotics that have high blood-brain barrier penetration. Meningitis is not treated with oral antibiotics. ...Read more

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I have a bad UTI & taking a strong antibiotic. My blood test (sugar/lipids/hemoglobin) is in 2 days. Would it affect results? Should I reschedule?

I have a bad UTI & taking a strong antibiotic. My blood test (sugar/lipids/hemoglobin) is in 2 days. Would it affect results? Should I reschedule?

Nope! Well, maybe...: Infections can make your sugar level rise in the short term but really shouldn't affect your 3 month a1c. Infections definitely won't affect lipids (cholesterol) or hemoglobin (blood count). Of course, your doc might have a different opinion so best to call his/her office ; ask. ...Read more

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I take warfarin because I have factor v leiden and I've already had my monthly blood test, but my pcp prescribed an antibiotic. Should I retest soon?

I take warfarin because I have factor v leiden and I've already had my monthly blood test, but my pcp prescribed an antibiotic.  Should I retest soon?

Yes: Any antibiotic can raise your protime/inr level. It is important to monitor closely around the use of antibiotics because of the loss of intestinal bacteria, which ordinarily produce vitamin k counteracting and balancing Coumadin (warfarin) activity. In the absence of these bacteria, your INR level can get very high, putting you at high risk for bleeding problems. Keep in close contact with your doctor. ...Read more

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I am 13 days late for my cycle i have taken 3 HPT and a blood test i have symptoms of pregnancy but all test come back negative can an antibiotic alter?

I am 13 days late for my cycle i have taken 3 HPT and a blood test i have symptoms of pregnancy but all test come back negative can an antibiotic alter?

See below: All of your statement may not have come through. However, if properly done pregnancy tests are negative at 13 days after a missed period, you not likely to be pregnant. If you continue to have doubts, you may ask your doctor to do an ultrasound examination.
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. Drink enough water daily, so that your urine is mostly colorless. 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, if you have sex. ...Read more

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My son's blood test report shows high values for liver function test. What is the problem he had viral fever and took antibiotics?

Liver function tests: Would need a lot more information such as what tests are elevated and the level of elevation. Some viral infections other than viral hepatitis can elevate the liver tests and some antibiotics also can do this. Generally the tests will return to normal over a period, but if they remain elevated further evaluation should be undertaken. ...Read more

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Swollen groin lymph nodes with pain and right pelvic pain, had blood test came back ok had antibiotics but its coming back what could be wrong?

Swollen groin lymph nodes with pain and right pelvic pain, had blood test came back ok had antibiotics but its coming back what could be wrong?

Swollen nodes: These lymph nodes react to infection/inflammation in the lower genital areas and legs. Infections in the ovary/ tube area would not affect these nodes. Also, lymph nodes throughout the body can be affected by generalized infections. You need a thorough check up to determine the cause. Once swollen these groin lymph nodes can often be felt as small pea/bean size masses forever even if infect'n goes. ...Read more

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I am using antibiotic cefspan 400 mg from last 6 days for typhoid relap treatment. I am feeling well. Should I perform igG and igM blood test now?

I am using antibiotic cefspan 400 mg from last 6 days for typhoid relap treatment. I am feeling well. Should I perform igG and igM blood test now?

Why?: You have already been diagnosed&being treated for relapse Typhoid Fever. How was it diagnosed. By blood culture or what test. How long ago was your last Typhoid Fever. Relapse is caused by Antibiotic Resistance or Incomplete Treatment ie not completing the full course of Antibiotics. What Antibiotis were you treated for how long. Were the rpt cultures neg. Follow the advice of doctor&take full course ...Read more

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Will a blood test show infection if I am currently taking antibiotics (doxycycline)? Is it possible for infection to spread when on antibiotics?

Will a blood test show infection if I am currently taking antibiotics (doxycycline)? Is it possible for infection to spread when on antibiotics?

Yes: It is possible to have an infection while on antibiotics, even possible for that infection to be resistant and untreated by that antibiotics. Cultures may grow more slowly in presence of antibiotics. The blood test may show an indication like an elevated WBC but if the infection is in the blood that would be trouble. ...Read more

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Tested positive 4 uti/Blood test neg. For kidney infection. I taken antibiotics for 2 days nothing helps the constant burning feeling in my lower back?

Tested positive 4 uti/Blood test neg. For kidney infection. I taken antibiotics for 2 days nothing helps the constant burning feeling in my lower back?

Too soon: Give the antibiotic 3-4 days to work and if not, contact the physician who prescribed it for a follow up and possible change to a different antibiotic (depending on the sensitivity of the microbial urine culture if one was done) ...Read more

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Coughing up yellow phlegm for nearly 3 months. Had xray antibiotics and blood test. Nothing. When I start breathing heavily during exercise it comesup?

Coughing up yellow phlegm for nearly 3 months. Had xray antibiotics and blood test. Nothing. When I start breathing heavily during exercise it comesup?

Inflammation: Likely inflammatory tracheo-bronchitis possibly environmentally induced. Development during exercise may indicate exercise induced wheezing. The yellow color reflects slow transit out of the lung not infection. Possible evaluation includes pfts and if negative a possible methacholine test for exercise related wheezing. If all studies negative a bronchoscopy may be in order as well as a chest ct. ...Read more

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I've taken antibiotics for 3 days for an uti. I have had a constant burning sensation in my lower back. Blood test was neg for kidney infection.?

Here are some...: Effective antibiotics resolves urinary symptoms usually in 1-3 days. Lower backache at times is blamed to be related with bladder infection, but oftentimes related with pelvic organs or lower spine. To help sort the possibly related yet confused events out correctly can be done reasonably easily by following instructions in http://formefirst.com/eNewsletter06.html. ...Read more