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Doctor insights on:
Blood Tests Negative
1
Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?
False negative PG: A false pregnancy test is possible however, in this case you also have a negative blood pregnancy test which is far more accurate. ...Read more
2
Preg test positive but blood test negative missed period?
Timing: It is possible that the urine pregnancy test detected HCG that was in the urine even as a pregnancy was failing (impending miscarriage) but by the time a blood test was done, the miscarriage had already occurred and the levels of the HCG pregnancy hormone were cleared. Alternatively, it could have just been a false (+) urine pregnancy test. ...Read more
3
Positive HSV culture but negative blood test; should tests be repeated?
Trust the culture: A positive herpes culture is diagnostic of herpes. I don't know why the blood test (antibody) was negative, but it's not used to make a diagnosis, only to determine whether the virus is present. I would trust the culture. ...Read more
4
Negative herpes culture and blood tests; pretty accurate?
Likely OK.: I don't know what your history is but if you had/have a herpes infection, you likely would have noticed skin lesions that could be irritating at some point in time. Many times there can be no symptoms but if you have this there would be some kind of outbreak at some point in time. The tests include tzank prep. Of scrapings that show giant cells, cultures are pos. In 48-96 h, elisa+pcr are great. ...Read more
5
Positive HIV screener test at blood donation... Negative IFA and Negative NAT... False positive?
Yes: The initial screening test for HIV is very sensitive, but not very specific. The back up screening tests are much more specific for HIV. ...Read more
6
Blood tests positive but biopsy and urease test negative for h.pylori. Is this normal?
The blood test for: H. Pylori checks for antibodies against the bacterium. Antibodies are proteins that help your body fight off infection and they may be detectable indefinitely, even for a lifetime. Biopsy & urease tests check for presence of an active infection. (+) H. Pylori blood test with negative biopsy & urease suggests you had the infection in the past but that it's not currently active. ...Read more
7
Postive urine tests and negative blood test and pregnancy symtoms. Could i be pregnant?
Need to re do test: Blood test is generally more sensitive and reliable than a urine test for pregnancy. You may wish to repeat the urine test as you can do that home. Use first morning urine and follow the instructions for the test carefully. Only do the home test if you are 4-5 days past the expected onset of your period. ...Read more
8
Positive blood serum pregnancy test June 27. Urine tests still neg. should I be concerned?
June 27? today 6/22: I think you meant 6/17? Serum pregnancy test can detect pregnancy quite a bit earlier than the urine test can... if you tested positive on 6/17 with serum, the urine test should be coming soon.. any question/concern, consult doc. Good luck. ...Read more
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9
What are quantitative hCG blood tests?
Hormone test: Human chorionic gonadotrophic hormone is generally increased in pregnancy and serves as the basis of pregnancy tests. Quantitative HCG tests also provide information about the health of the placenta. High HCG levels are also seen in some tumors of the ovary and testes. ...Read more
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10
Faecal occult blood test positive danger?
Maybe: The fecal occult blood test can be quite sensitive and may show blood in the stool from minor gastritis or esophagitis that is not significant. But, it could also be due to a large polyp or tumor so colonoscopy is always indicated when the fecal occult blood test is positive. Your primary doctor should be arranging this in the near future. ...Read more
11
Faint pregnancy test and blood test results negative could I be pregnant?
If unprotected-yes: repeat test in 5 days or see GYN for a pelvic exam ...Read more
12
Blood tests show inflammation, ELISA tested pos., WB tested Neg. Blood gas tested high, all other test normal, normal MRI. Swelling, dizzy, weak, numb?
More specifics: ELISA for what? WB for what? HIV, Lyme, Chukungaya? Please fill in the gaps and perhaps we can help. ...Read more
13
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
14
Can home fingerstick blood tests test for hypoglycemia?
Yes: Home kits can measure your blood sugar and are available over the counter or with a presciption. They can test for low blood sugar, aka hypoglycemia. ...Read more
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15
Endometrium present 18 days on period negative pregnancy test results via blood and urine tests. Possible causes?
Unclear meaning: Not sure what you mean by "endometrium present." This needs clarification. If you mean that you have been bleeding for 18 days then you will need to see an Obgyn for evaluation, STD testing, possible a sonogram and you can discuss options for cycle control. ...Read more
16
Do blood and urine tests test for benzodiazepines?
Of course: The screening is most often done using a blood or urine sample. These tests are sometimes administrated as part of an investigation for drug use or abuse. ...Read more
17
Can you be pregnant after negative urine tests and a negative blood test?
Not likely: Not very likely however it you feel pregnant you may repeat the blood test. ...Read more
18
When are blood pregnancy tests accurate?
Pretty quick: The hormone betaHCG is detectable within 5-7 days of implantation. So it can be positve before a missed period. ...Read more
19
Blood pregnancy tests detect pregnancy sooner than urine pregnancy tests, correct?
Yes: Yes is correct! the blood test will turn positive at least several days earlier. ...Read more
20
Ana positive result (1:1280) in blood tests. All other blood tests normal. What could that mean?
Risk: That may mean you are at higher risk to develop an autoimmune disorders in the future. Since you are suffering from back pain already at your young age, perhaps you should see a rheumatologist to find out if there is any autoimmune disorder affecting your back unless the cause for the back pain is already known. ...Read more
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