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Doctor insights on: Prothrombin Time Pt Test

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What do these tests do: clotting time, bleeding time, prothrombin time?

What do these tests do: clotting time, bleeding time, prothrombin time?

Screen: These are various assays to look for problems with the platelets (especially bleeding time) and some of the clotting factors (prothrombin time, the old-fashioned clotting time). Good luck with your workup. ...Read more

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Dr. Shimae Fitzgibbons
211 doctors shared insights

Prothrombin Time (Definition)

Prothrombin time provides information regarding the extrinsic pathway involved in clot formation. It's commonly used ...Read more


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Thrombocytopenia affects your prothrombin time test on your lab results?

Thrombocytopenia affects your prothrombin time test on your lab results?

No. Bleeding time.: In thrombocytopenia, both prothrombin time (pt) and partial thromboplastin time (PTT) are normal. But bleeding time and platelet count are affected. Bleeding time is prolonged and the platelet count is decreased. ...Read more

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Received 2 positive beta2 glycoprotein1 IgM blood tests 9 weeks apart. Doc won't order re-test. Does ubiquinol influence test results?

Received 2 positive beta2 glycoprotein1 IgM blood tests 9 weeks apart.  Doc won't order re-test.  Does ubiquinol influence test results?

See below: Technically to meet criteria for antiphospholipid antibody syndrome, one must have two separate positive results at least 12 weeks apart and have some manifestation of antiphospholipid anitbody. I am not aware of ubiquinol influencing these test results. ...Read more

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Patient on acitrom, aftr DVT & PE, after 5 days of discharge a PTT is done PTT patient=20.2s, ctrol=15s,PT Ratio=1.34,INR=1.3, kindly expln t result.

Patient on acitrom, aftr DVT & PE, after 5 days of discharge a PTT is done PTT patient=20.2s, ctrol=15s,PT Ratio=1.34,INR=1.3, kindly expln t result.

Keep taking med: The medicine that you are taking is a Vitamin K antagonist. It slowly decreases Vitami K dependent proteins that help blood to clot. It can take anywhere from 3-7 days for these proteins to be depleted. Also you need to limit or avoid foods high in Vitamin K (please Google these). Continue the medication and see your provider as scheduled. ...Read more

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9 positive pregnancy tests, then heavy bleeding and now negative tests. what happened?

9 positive pregnancy tests, then heavy bleeding and now negative tests. what happened?

Pregnancy test: There is a possibility that you were pregnant and had a miscarriage. You need to see your doctor for an evaluation. ...Read more

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Hemoglobin drops 1 pr after every blood test. ferritin high tibc iron normal tsat 12%. hem says no iron def? pt ptt slightly prolonged. further tests?

Hemoglobin drops 1 pr after every blood test. ferritin high tibc iron normal tsat 12%. hem says no iron def? pt ptt slightly prolonged. further tests?

Follow MD advice: 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, do you have any symptoms? It is the patient who needs to be treated, not lab results. ...Read more

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Doc, my wife pregnant 6w, 3 times miscarriages, this 4th, after blood test her actual partial thromboplastin time High: 45.3....means?

Doc, my wife pregnant 6w, 3 times miscarriages, this 4th, after blood test her actual partial thromboplastin time High: 45.3....means?

OB-Gyn Consult: Partial thromboplastin time (PTT) is a blood test that measures the time it takes your blood to clot. A longer-than-normal PTT or APTT can mean a lack of or low level of one of the blood clotting factors or another substance needed to clot blood.A longer-than-normal PTT may be caused by conditions such as antiphospholipid antibody syndrome or lupus anticoagulant syndrome (increase miscarriage). ...Read more

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Hiv1/2 eia negative at 8 & 23 weeks. Will test again at 48 weeks. Will a negative test be conclusive?

Hiv1/2 eia negative at 8 & 23 weeks.  Will test again at 48 weeks.  Will a negative test be conclusive?

HIV testing: Yes. You are not HIV positive. In the future there is a test that is 100% accurate at 14 days. This is the HIV RNA or pcr test. You do not have hiv. Testing regularly is a good habit to get into when you are sexually active. And, please do not forget there are eleven other stds to avoid. ...Read more

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Erosive gastritis. h.pylori blood test positive, breath test positive, stool antigen test negative, biopsy negative. what to do ?

Erosive gastritis. h.pylori blood test positive, breath test positive, stool antigen test negative, biopsy negative.  what to do ?

Treat it: The positive H. pylori antibody test is not a reliable indicator of current infection. The gold standard for H. pylori treatment is the gastric biopsy, and this is negative in this patient. However, I am impressed by the positive breath test and erosive gastritis. I would have expected stool antigen to be positive, as it mirrors the breath test. Given the discrepant results, treat the patient. ...Read more

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Hiv rna test result undetected after unprotected blowjob at day17. Test range 40 to 10mil. Is it conclusive?regular hiv test neg at 15 days. Hiv?

Hiv rna test result undetected after unprotected blowjob at day17. Test range 40 to 10mil. Is it conclusive?regular hiv test neg at 15 days. Hiv?

No risk: HIV is rarely transmitted by oral sex. If you were the receiver of the BJ, you can be sure you weren't infected: there are few if any proved cases of oral to genital HIV transmission. Most experts would have recommended against an RNA test in this situation, but the negative result is additional strong evidence you weren't infected. The "regular" test is only slightly reassuring, 4-6 wk minimum. ...Read more

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B12 inj(500mcg) for a week, does it increase clotting time,bleeding time?does it affect prothrombin time & INR? what supplements needed on B12 therapy

B12 inj(500mcg) for a week, does it increase clotting time,bleeding time?does it affect prothrombin time & INR? what supplements needed on B12 therapy

B12: B12 itself will not influence clotting or bleeding. However, as anemia corrects, blood clotting improves. Platelet count can raise as B12 improves marrow. Take folic acid, other B vitamins, and get potassium from food. ...Read more

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Elisa hbsag was negative in may 2013 befr my dnc.Now another lab test shows hbsag positive during blood test fr fertility treatmnt.can tis be true?

Elisa hbsag was negative in may 2013 befr my dnc.Now another lab test shows hbsag positive during blood test fr fertility treatmnt.can tis be true?

Yes, but...: If a person converts from HepBsAg negative to HepBsAg positive, her primary care doctor can evaluate her and order a larger panel of Hepatitis B tests to see what is going on. If HepBsAg is confirmed to be positive, the patient is contagious with HepB viruses (which are spread through blood and bodily fluids contact). That means all household contacts should have their HepB immunity confirmed. ...Read more

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19 days after ovulation, blood tests for pregn > negative; can it still be to early to detect in blood tests? Plse help

No: If you did in fact ovulate 19 days ago, the pregnancy test should be positive. Blood pregnancy tests are extremely accurate. How did you determine you ovulated? Ovulation predictor kit? Repeat test if you cannot confirm ovulation time. ...Read more

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7negative stool test done at different times, have anemia, not bleeding, endoscopy negative doc still wants colonoscopy. Why when all negative?

7negative stool test done at different times, have anemia, not bleeding, endoscopy negative doc still wants colonoscopy. Why when all negative?

Bleeding can be...: ...intermittent, from any source. If there is clinical evidence that points to the GI tract as a likely source of your anemia then colonoscopy is indeed warranted. ...Read more