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Doctor insights on: Synacthen Test

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Preg test positive but blood test negative missed period?

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

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Invalid pregnancy test result. How come?

Invalid pregnancy test result. How come?

Invalid preg test?: Urine pregnancy tests can be "too early" to be valid. You need to be at least 5 days past your expected period. Urine also needs to be 1st of the morning (concentrated) to be valid. ...Read more

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Mantoux test positive?

Mantoux test positive?

Work up needed: At the very least it may suggest that you have been exposed to tuberculosis. You should visit with your doctor to have questions asked about whether or not you have TB symptoms to suggest infection such as do you have a cough? Unexplained night sweats? Unexplained weight loss, fevers or chills and fatigue? You also need to have a chest x ray performed - since organism is usually inhaled. ...Read more

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Is a four week negative HIV antibody test / negative PCR test reliable?

Is a four week negative HIV antibody test / negative PCR test reliable?

HIV diagnosis: Antibody titers have been reported to be delayed as long as six months, but this is very unusual. A negative pcr for viral RNA is virtually determinative of the absence of infection. ...Read more

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I took 7 home pregnancy test all positive but doctor test say negative and blood test was negative why?

I took 7 home pregnancy test all positive but doctor test say negative and blood test was negative why?

Please clarify: Perhaps the reason can be known when you tell us honestly why you kept testing at home even though the test told you a positive answer. Something must have clued you into the fact something was not normal. You tell us. ...Read more

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Home pregnancy test was positive but blood hCG came back negative. Ob perform a blood test again. Hcg 750 progesterone 21. Why first hCG was negative?

Home pregnancy test was positive but blood hCG came back negative. Ob perform a blood test again. Hcg 750 progesterone 21. Why first hCG was negative?

Lab error: Presuming the first blood pregnancy test was close to the second, one of them had to be a lab error, probably the first one that was negative. If there is any question about the health of the pregnancy, your doctor can follow the bhcg level to see if it is rising appropriately and obtain an ultrasound when the level is high enough.For more info www.Askyourgynecologist.Org. ...Read more

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Positive blood serum pregnancy test June 27. Urine tests still neg. should I be concerned?

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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Faint positive hpt w/ first morn urine, neg dr. Urine test later that day, blood test came back post. Why was drs urine test neg? Early testing?

Faint positive hpt w/ first morn urine, neg dr. Urine test later that day, blood test came back post. Why was drs urine test neg? Early testing?

Pregnancy tests: Blood tests are more sensitive than urine tests, especially in early pregnancy. First morning urine is usually more concentrated than urine produced later in the day. Eating and drinking can dilute the urine enough to cause a false-negative result. That is why the blood test is done for confirmation. ...Read more

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3 days late 2posative clear blue digital test 1negative cheap test a negative doctor test. Am i pregnant?

3 days late 2posative clear blue digital test 1negative cheap test a negative doctor test. Am i pregnant?

If doubt then : There is not a way that we can tell you if you are pregnant if you have done one test that is positive and one that is negative. We would simply be guessing which test is correct. In this case you will need to see a doctor for a blood bhcg test. ...Read more

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5days late now 2 expensive test came positive 2 cheap test was negative. Doctor urine test negative. Am i pregnant? Please need help.

5days late now 2 expensive test came positive 2 cheap test was negative. Doctor urine test negative. Am i pregnant? Please need help.

Blood test : If you are getting different results from different urine tests then the only way to confirm which is correct is to do a blood bhcg hormone test. Without that we would be simply guessing which test to believe. ...Read more

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Pale positive pregnant test n dr test negative then did again at home n its negative?

Pale positive pregnant test n dr test negative then did again at home n its negative?

Thank you: Thank you for letting us know. The question, i assume, since you did not ask one is can you be pregnant.? And it appears that you are not pregnant. Or you were pregnant but it died or was not viable. ...Read more

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Can blood test show if I am pregnant. If urine test showed negative?

Can blood test show if I am pregnant. If urine test showed negative?

Possibly.: These tests are good, but like all tests, can have variations. Blood tests can detect this shortly after implantation as well as urine tests that are sensitive, but less sensitive blood and urine tests need 3-4 more days to become positive. No two people are alike either, so that can cause variations also. Time and a specific quantitative test can best confirm this, so see your dr. To be sure. ...Read more

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Positive quantiferon gold test but negative xray?

Positive quantiferon gold test but negative xray?

See below: It means that you have been exposed to tb. A chest x-ray that is positive would indicate either past or active infection. ...Read more

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Why did I get three positive pregnancy test and blood tested negative?

Why did I get three positive pregnancy test and blood tested negative?

5 reasons: There are several reasons why a woman may obtain a positive result on an a home pregnancy test when she is not actually pregnant. 1. False positive pregnancy test due to improper testing. 2. Evaporation line on a pregnancy test. 3. Certain medical conditions can lead to false positive test results. 4.False positive pregnancy tests can be caused by certain medicine 5. Defective pregnancy tests. ...Read more

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What is the ssa/Ssb blot test antibody blood test?

What is the ssa/Ssb blot test antibody blood test?

A test: for a certain autoimmune condition. it's important to understand that these blood tests need to be interpreted carefully in the context of your symptoms and exam findings. a positive test doesn't necessarily mean you have the condition. ...Read more

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Hcg 50 positive blood test two negative urine please help.

Hcg 50 positive blood test two negative urine please help.

Recheck blood: You need to have the blood levels checked again. You expect the level to about double in 2 days with a normal pregnancy. ...Read more

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Is tensilon test done?

Rarely: While still useful as a discussion point to show how disruption of acetylcholine receptors causes myasthenia gravis, the tensilon test is slowly mbeing supplanted by laboratory and electrical tests that are more sensitive and reliable. ...Read more