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Urine is the product of the kidneys, which is produced to eliminate the waste products of metabolism, manage body fluid balance, &maintain acid-base balance. The blood is first filtered by the kidneys, and the composition of the resulting fluid is then altered depending on the body's needs. It is composed of mostly water, and breakdown products from blood cells impart ...Read more
Can pregnancy blood test give false negative. 3 days late, urine test negative and blood test negative too?
Testing: Chlamydia tests include a culture that may take 5 to 7 days to grow. A direct fluorescent antibody test looks for antigens. A nucleic acid hybridization test or a nucleic acid amplification test looks for chlamydia dna &enzyme –linked immunosorbent assay. Directing sampling uses fluids from cervix, urethra throat, eye (whichever area is impacted). Urine testing is also possible. ...Read more
Yes: Yes is correct! the blood test will turn positive at least several days earlier. ...Read more
See below: If you do not have symptoms of uti, don't worry. ...Read more
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 moreSee 2 more doctor answers
Good question: Test strips have a number of small pads each 1 is impregnated with chemicals that react with various substances in urine causing little pad to change color. Amount of color change depends upon concentration of substance, acidity & concentration of substance present. 1 pad each 4 specific gravity (concentration), acidity, glucose, protein, ketones, blood, nitrite 4 uti, leucocyte esterase 4 wbcs. ...Read more
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
Urine pregnancy test positive one week with blood hCG of 1 and the next week urine pregnancy test negative?
Not sure : What you meanGet a more detailed answer ›
Urine dipstick: Usually not accurate enough!Get a more detailed answer ›