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Doctor insights on: Is Blood Work Done Before A Colonoscopy

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Getting a colonoscopy, and along with that there going to do blood work. I am a minor. Will a doctor be able to tell if I have marijuana in my system?

Getting a colonoscopy, and along with that there going to do blood work. I am a minor. Will a doctor be able to tell if I have marijuana in my system?

Drug tests: Are not usually part of the workup for a colonoscopy. But if for some reason your doctor does decide to to a drug screen (more often tested via urine than blood), thc could show up depending on frequency of use. ...Read more

Dr. Charles Cattano
2,044 Doctors shared insights

Colonoscopy (Definition)

Colonoscopy is the procedure of using a long flexible camera to visualize the entire colon from the inside with the option to take pictures, video, perform biopsies, remove polyps, etc. Generally people are sedated and do ...Read more


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Having tummy issues for a few weeks. On acid reduces. Have had colonoscopy and gastric with clear results. Blood work and stool clear.

Having tummy issues for a few weeks. On acid reduces. Have had colonoscopy and gastric with clear results. Blood work and stool clear.

Probiotics: Question is too vague. Try probiotics. Diet likely major role. Lactose or fructose intolerances are common. Follow up with your gastroenterologist. Read more at www. Browardgi. Com. ...Read more

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My mother have been loosing weight the last year, she is down to 46 KG now. They did scan's, blood work and colonoscopy, found nothing wrong, she eats healthy but is still loosing weight. She is not ill, just complains about her bones hurting.

My mother have been loosing weight the last year, she is down to 46 KG now. They did scan's, blood work and colonoscopy, found nothing wrong, she eats healthy but is still loosing weight. She is not ill, just complains about her bones hurting.

Keep investigating.: Investigation into cause needs to continue here. Her weight loss sounds significant, and she does have symptoms which could be targeted for testing. Unintentional weight loss could be a harbinger of a significant underlying issue which needs to be elucidated. Her bone pain may be the hint that we need to solidify a diagnosis. ...Read more

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Do I need to fast for preop blood work for a colonscopy?

Do I need to fast for preop blood work for a colonscopy?

Usually not.: Fasting is recommended when checking cholesterol and sugars. These aren't standard blood tests associated with colonoscopies. ...Read more

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Diarrhea for a month, colonoscopy, endoscopy done, all cultures & blood work negative, eliminated red meat & dairy, started a probiotic, what else?

Diarrhea for a month, colonoscopy, endoscopy done, all cultures & blood work negative, eliminated red meat & dairy, started a probiotic, what else?

Full workup: It sounds as if you have had a full work up done for diarrhea and remain symptomatic? Stool studies, colon biopsies and capsule endoscopy may be of utility. Ask your doctor for further recommendations. ...Read more

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Can anyone give some suggestions as to what I may have? Ok long story short im sick, I've had xrays done blood work urine test ultra sounds colonoscopy gastroscope exam, even had my gallbladder removed (how this all began) my symptoms are: sever abdominal

Can anyone give some suggestions as to what I may have? Ok long story short im sick, I've had xrays done blood work urine test ultra sounds colonoscopy gastroscope exam, even had my gallbladder removed (how this all began) my symptoms are: sever abdominal

You: You need a thorough checkup, possibly with ct scan or mri, there is no way anyone could pinpoint the diagnosis from the plethora of symptoms you have. More than likely, it is not something you could shrug off; if this were me, I would be in my doctors waiting room or possibly even er today. Please do not take this lightly, you need medical attention now. ...Read more

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Should a colonoscopy be done if a 17 year old girl has moderate blood in her stool for two days?

Should a colonoscopy be done if a 17 year old girl has moderate blood in her stool for two days?

Bloody stool: That is not the first line of treatment. Have her seen, though. There are some simpler tests to be done, first. ...Read more

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Hemmero rupture? Previously 2 hemerroids ruptured had an EGD and colonoscopy done everything normal but today had tiny bit of blood after wiping bum

Hemmero rupture? Previously 2 hemerroids ruptured had an EGD and colonoscopy done everything normal but today had tiny bit of blood after wiping bum

Normal: You can have hemorrhoids and if they appear when you are constipated you can have a little bleeding from the hemorrhoid or a small rectal fissure which bleeds No problem take more fiber in your diet and even more fresh vegetables and or take fiber drinbks ...Read more

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Had colonoscopy done recently. All is fine. But there is still bright red blood in the stool. Removed 3 polyps. Inner hemorrhoid found. What's wrong?

Had colonoscopy done recently. All is fine. But there is still bright red blood in the stool. Removed 3 polyps. Inner hemorrhoid found. What's wrong?

Rectal bleeding: Continued bleeding for several days is possible after polypectomy, especially if you have taken aspirin in the last 2 weeks or recently used ibuprofen or other non steroidal antiinflammatory medications. If the bleeding persists for more than a week, please see your doctor. ...Read more

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Just turned 50. My primary care doc did lots of blood work, a prostate exam, & sent me for a colonoscopy. Shouldn't I have a dermatologist check me?

Just turned 50. My primary care doc did lots of blood work, a prostate exam, & sent me for a colonoscopy. Shouldn't I have a dermatologist check me?

Confusing question: Your primary physician is trained to make an initial assessment of your skin and I suppose he/she also did a general physical exam. Just ordering blood and doing a prostate exam is not any sort of routine office visit. The general exam looks for skin issues, although it may not have been discussed. You are always free to consult a dermatologist if you have a specific concern. ...Read more

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Good day, I have pain passing out stool some times with blood. Treatment has not resolved the issue completely. Looking for a gastroenterologist who can do a colonoscopy in their rooms. I will also like to have a prostate exam done. Thanks?

Good day, I have pain passing out stool some times with blood. Treatment has not resolved the issue completely. Looking for a gastroenterologist who can do a colonoscopy in their rooms. I will also like to have a prostate exam done. Thanks?

Pain/blood w/stool: Pain & blood may be from hemorrhoids, fissures, ulcerations as in ulcerative colitis, Crohns disease or polyps, mass. Go to your nearest ER for evaluation/referral t ogastroenterology. Colonoscopies in the US are done in special surgical suites or hospitals as they are done under anesthesia, you could discuss that at your local hospital ER. A urologist is best for prostate ...Read more

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Got colonoscopy done tody. Waiting for biopsy results. Got hemorrhoid because of the prep I had to do. It hurts. Have pus n blood. What do I do? How long it to heal? Will it agitat with bowl movement?

Got colonoscopy done tody. Waiting for biopsy results. Got hemorrhoid because of the prep I had to do. It hurts. Have pus n blood. What do I do? How long it to heal? Will it agitat with bowl movement?

Call the doctor that did: Call the doctor that did the colonoscopy. Also do not soak to the area and a suppository or cream like preparation H. Also his stool softeners Like Colace (docusate sodium) ...Read more

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Do I need a colonoscopy because my hemoglobin, hematocrit, and MCV were low? Wouldn't another blood test be the next step? I'm 60 and healthy. My iron was okay when I donated blood 20 days before the blood panel was done on 12-5-11. Could donating blood

Do I need a colonoscopy because my hemoglobin, hematocrit, and MCV were low? Wouldn't another blood test be the next step? I'm 60 and healthy. My iron was okay when I donated blood 20 days before the blood panel was done on 12-5-11. Could donating blood

The: The tests very well could have come back low due to you donating blood. A good idea would be to take iron or a daily multi-vitamin for 3 months then repeat the anemia panel. If you still have anemia your doctor can do a simple test of your stool to check for the presence of blood. If it is positive then you should have another colonoscopy.
Best of luck. ...Read more

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Mucus in stool Everyday. GI dr says its ibs. Blood test and stool culture normal. Colonoscopy not done. Can ibs cause mucus in stool Everyday?

Mucus in stool Everyday. GI dr says its ibs. Blood test and stool culture normal. Colonoscopy not done. Can ibs cause mucus in stool Everyday?

Mucus on stool: Mucus discharge occurs in up to 50% of patients with irritable bowel syndrome, with or without pain. Mucus may also be produced in response to partial obstruction, chronic constipation, rectal dysfunction, infection, & even from secretory villous tumors of the rectum, among others. ...Read more

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I have occasional bloody diarrhea. Colonoscopy done dr said everything was clear, no polyps, no cancer, no parasites, clean healthy colon. Why blood?

I have occasional bloody diarrhea. Colonoscopy done dr said everything was clear, no polyps, no cancer, no parasites, clean healthy colon. Why blood?

Bloody diarrhea: There can be several causes for your bloody diarrhea such as a bleeding hemorrhoid, an anal fissure., or a possible bacterial infection. ...Read more

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How accurate are occult blood stool IA tests? I had 7 done, all negative, have anemia, I know its from food, not bleeding, doc still wants colonoscopy

How accurate are occult blood stool IA tests? I had 7 done, all negative, have anemia, I know its from food, not bleeding, doc still wants colonoscopy

Investigate iron def: If an adult has anemia DUE TO IRON DEFICIENCY, the cause is almost always blood loss. In men and non-menstruating women, the blood loss is almost always from the gastrointestinal tract. If iron deficiency (not just anemia) has been well proven, and the patient does not menstruate, endoscopy is warranted no matter what the occult blood stool test shows. ...Read more

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28 yo clear colonoscopy and endoscopy, and all full blood work that came back normal as well. Could pancreatic cancer be causing my low abdomen pain?

28 yo clear colonoscopy and endoscopy, and all full blood work that came back normal as well. Could pancreatic cancer be causing my low abdomen pain?

Highly unlikely: Put your mind at ease. Pancreatic cancer is rare below age 45. The pain of pancreatic cancer usually is in the pit of the stomach, not the lower abdomen, and radiates around to the sides and/or straight thru to the back. It may be intermittent and made worse by eating or lying supine. It is frequently worse at night. Lying in a curled or fetal position may improve the pain. ...Read more

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What could this be, rectal bleeding with clumping of 100% straight blood? "no stool just bright blood" I am trying to help my husband with this problem. He has been to a doctor and a colonoscopy and MRI were done. The colonoscopy was said to show only

What could this be, rectal bleeding with clumping of 100% straight blood? "no stool just bright blood" I am trying to help my husband with this problem. He has been to a doctor and a colonoscopy and MRI were done. The colonoscopy was said to show only

Internal hemorrhoids: This type of large amounts of bright red bleeding without stool and no pain and a negative colonoscopy is almost always due to vascular internal hemorrhoid, you need to see a colon and rectal surgeon, many times this can be treated with a simple office procedure (rbl). ...Read more

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Abd ultrasound 2 months ago normal. Blood work and colonoscopy normal. 25 y/o f. Depressed. No appetite. Ulq pain. Pancreatic cancer? Would I be jaund

Abd ultrasound 2 months ago normal. Blood work and colonoscopy normal. 25 y/o f. Depressed. No appetite. Ulq pain. Pancreatic cancer? Would I be jaund

Not likely: You are not in the right age for pancreatic cancer which occurs in 50-60 year olds, unlikely under 40 years. Go see your primary care and he/she can help you. Low appetite can be due to depression. If your pain in belly is persistent, or getting worse a ct scan of the abdomen can be done to check it all out thoroughly. ...Read more

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Fistulotomy & lis done. Short colonoscopy-normal. After 1.5 month from surgery bowl movement small amount of blood in stool and little mucus. Normal?

Possibly: If you have kept stools soft for at least 6 weeks following your procedure then the majority of healing should be done. If you have been constipated due to pain medications then you may have caused some minor bleeding. Keep stools soft for at least 3 months following such a procedure. ...Read more

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Can colonoscopy (done by an incompetent doctor) cause colon cancer? Suppose the doctor nicks something you know? There's bright red blood in my stool.

Colonoscopy: Colonoscopy by an incompetent doctor cannot cause colon cancer although it could have missed colon cancer. If a hole was put in the colon then there could be severe infection. Recommend reviewing your results of the colonoscopy because polyps, hemorrhoids, colitis, and diverticulosis could all cause rectal bleeding. ...Read more

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If 8 months colonoscopy was done and a CT scan 2 months ago and all clear, what could be the cause of blood in stool? Could cancer redevelop in 2 months

If 8 months colonoscopy was done and a CT scan 2 months ago and all clear, what could be the cause of blood in stool? Could cancer redevelop in 2 months

Unlikely: In a female of your young age colon cancer would very unlikely unless there are genetic causes the colonoscopy is more sensitive than a ct scan in finding early polyps and cancer polyps can be missed by the doctor if the procedure is not thorough or done by an experienced operator common causes of blood if on surface of stool or in the bowl are hemorrhoids or anal causes. ...Read more

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Lower back stiffness for several months. X-ray and blood work normal. Bleeding with bowel movement 1 time. Dr. recommends colonoscopy. Other options?

Lower back stiffness for several months. X-ray and blood work normal. Bleeding with bowel movement 1 time. Dr. recommends colonoscopy. Other options?

An alternative is: Checking your bowel movements for the presence of blood over several months. Colonoscopy is not necessary if tests for blood in the stool are negative over time and there is no family history of colon cancer. Your lower back stiffness is most likely muscular. Try gentle low back exercises every day after a warm shower. See: http://orthoinfo. Aaos. Org/topic. Cfm? Topic=a00302 ...Read more

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Was on amitriptyline 10mg, doc wanted to reduce it to half because I was constipated. Been 5 days at half, and now experiencing diarrhea. Ibs? I've had normal colonoscopy, blood work, xray. Worried.

Was on amitriptyline 10mg, doc wanted to reduce it to half because I was constipated. Been 5 days at half, and now experiencing diarrhea. Ibs? I've had normal colonoscopy, blood work, xray. Worried.

Stop worrying: There is no reason for vorrying if the diarrhea continues than check it with your doctor or gastroenterologist. Just drink some extra fluids and take immodium for diarrhea and if it persists check with your doctor. ...Read more

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Could stress cause high crp leves (32.50) and gastrointestinal problems? Have done colonoscopy/ct scan/ultrasound/fecal/blood test all clear?

Could stress cause high crp leves (32.50) and gastrointestinal problems? Have done colonoscopy/ct scan/ultrasound/fecal/blood test all clear?

Not a reliable test: CRP is not a particulalrly useful test for any medical condition. If you have any gastrointestinal problems you should go see a physician who can investigate it further and guide you accordingly ...Read more

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Should I have exploratory surgery on my abdomen? I have been dealing with stomach and/or intestinal issues for a couple of years now. I have had many tests such as, endoscopy, colonoscopy, xrays, ct's, tons of blood work, gall bladder scan and stomach emp

Should I have exploratory surgery on my abdomen? I have been dealing with stomach and/or intestinal issues for a couple of years now. I have had many tests such as, endoscopy, colonoscopy, xrays, ct's, tons of blood work, gall bladder scan and stomach emp

First: First of all you need a surgeon who is willing to do an ex lap surgery. The only thing I think they may find is possible scar tissue and honestly I am not sure this would cause all of your symptoms. It sounds like you may be dealing with ibs (irritable bowel syndrome), however the vomiting is not characteristic. Have you or were you ever exposed to any chemicals or lived near an industrial plant? Is it possible that you are ingesting a substance that you are unaware of? Consider your surroundings and everything you take in. Is anything different in your life since this all started? If you think of anything discuss this with your doctors; every bit of information may be helpful in solving this puzzle.
I hope you find answers soon. ...Read more

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Bad gas pain upper ab pain and constipation. Negative colonoscopy endoscopy full body CT scan normal blood test thyroid blood work normal. I'm lost?

Bad gas pain upper ab pain and constipation. Negative colonoscopy endoscopy full body CT scan normal blood test thyroid blood work normal. I'm lost?

I'd say IBS like,,,,: I would say that this is a case of ibs or irritable bowel syndrome. You have gas and constipation, with pain. This is a classic presentation. You could likely improve these symptoms dramatically with a diet high in fiber, with vegetables and fruit along with enough protein from meats. More fluid consumption also helps. Best of luck. ...Read more

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Nausea, upset stomach, weak, forceful heartbeat, lightheaded, 30 lbs weight loss. Had endo/colonoscopy (dec 2013), CT of abd, blood work. What next?

Nausea, upset stomach, weak, forceful heartbeat, lightheaded, 30 lbs weight loss. Had endo/colonoscopy (dec 2013), CT of abd, blood work. What next?

Reevaluation: Typically, the evaluation of unusual symptoms initially focuses on ruling out the most likely and the most dangerous causes of symptoms/findings. When workup does not reveal a problem, we reevaluate. Sometimes the symptoms or physical findings have changed, making the diagnosis more clear. If not, we consider the less likely/less dangerous ones. If workup complete & no answer, seek 2nd opinion. ...Read more

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Luq pain, colonoscopy, blood work, stool cultures normal. Abdomen not tender. Colicky pain - feels like cramp you get after eating and exercising right away. New depressed.25 y/o f. Pancreatic cancer?

Luq pain, colonoscopy, blood work, stool cultures normal. Abdomen not tender. Colicky pain - feels like cramp you get after eating and exercising right away. New depressed.25 y/o f. Pancreatic cancer?

Not likely related: Pancreatic cancer is extraordinarily unlikely in a 25 year old. Working with an internist and/or a gastroentrologist is important in figuring out what is wrong. ...Read more

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63 year-old woman still has continuous mild stomach pain affecting her daily life, despite 3 yrs of medical treatment for gastritis found after.....?

63 year-old woman still has continuous mild stomach pain affecting her daily life, despite 3 yrs of medical treatment for gastritis found after.....?

Interesting: From your treatment so far it looks like that you have had a good workup. Two things may have been overlooked like your diet, your emotional situation. Your obesity might indicate irritating and poor choice of foods. Snoring might indicate restless sleep that may indicate an ear, nose & throat problem or a psychiatric problem. Please consult with your family physician. & see him/her for a referral to a psychologist. ...Read more

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I had a lower colonoscopy and the doctors found nothing abnormal. I still have a fair amount of blood after going the toilet. Should I go back?

I had a lower colonoscopy and the doctors found nothing abnormal. I still have a fair amount of blood after going the toilet. Should I go back?

Colorectal Surgeon: The bleeding you describe (despite a normal colonoscopy, which does not view the anal canal well) is most likely the result of either internal hemorrhoids or an anal fissure, both of which are often easily treated. I would strongly advise you to see a colorectal surgeon who can diagnose the problem and most likely treat it with either medication or a simple office procedure. ...Read more

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I get blood in poo - had colonoscopy 4 years ago - everything fine so what's going on?

Depends: Could be anything from hemorrhoids, fissures, or a GI source. Best to discuss with the doctor who performed your colonoscopy and see if a repeat exam is indicated if no other source of the bleeding is easily identifiable. Things can change in 4 years. Don't ignore this. ...Read more

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Normal colonoscopy but blood in stool, what's wrong?

Normal colonoscopy but blood in stool, what's wrong?

See below: The colon is so huge that sometimes the camera doesn't catch a small bleed. Colonoscopies are important to make sure you don't have inflammation in the colon and it rules out serious causes. You might have a blood vessel that bleeds on and off. Or it might be something in the anal area like a crack in the wall causing some bleeding when you wipe. Also the bleed could be from above the colon. ...Read more