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Anti-streptolysin O (ASO or ASLO) is the antibody made against streptolysin O, an immunogenic, oxygen-labile streptococcal hemolytic exotoxin produced by most strains of group A and many strains of groups C and G Streptococcus bacteria. The "O" in the name stands for oxygen-labile; the other related toxin being oxygen-stable streptolysin-S.
Titers of 1:4 or higher is considered critical for Kell (compared to 1:16 for most other antibodies) and is considered to confer a high risk of fetal anemia. [17] Such high titers may be managed by weekly follow-up by obstetric ultrasound , assessing the peak systolic velocity of the fetal middle cerebral arterial (MCA), amniotic fluid volume ...
Titers of 1:8 or higher is considered critical for Kell. Titers of 1:16 or higher are considered critical for all other antibodies. After critical titer is reached, care is based on MCA scans. If antibodies are low and have a sudden jump later in pregnancy, an MCA scan is warranted.
Titers of 1:8 or higher is considered critical for Kell. Titers of 1:16 or higher are considered critical for all other antibodies. After critical titer is reached, care is based on MCA scans. If antibodies are low and have a sudden jump later in pregnancy, an MCA scan is warranted.
Post-streptococcus glomerulonephritis is more often associated with group A strep skin infection than it is with strep pharyngitis, so in a patient with suspected post-strep glomerulonephritis with a negative ASO titer, one can then obtain anti-DNase-B titers which are more sensitive for group A strep and for its various strains.
Mothers who are Rh negative (A−, B−, AB−, or O− blood types) and have anti-D antibodies (found on the antibody screen) need to determine the fetus's Rh antigen. If the fetus is also Rh negative (A−, B−, AB−, or O− blood types) then the pregnancy can be managed like any other pregnancy.
Seroconversion plays a major role in the diagnosis and treatment of hepatitis B infections. [60] As in other viral infections, seropositivity indicates that an individual has a sufficiently high concentration of antibody or antigen in the blood to be detectable by standard techniques.
Exposure to fetal blood cells that can cause RhD alloimmunization can happen during normal pregnancy and delivery, miscarriage, amniocentesis, cordocentesis, chorionic villus sampling, external cephalic version, or trauma. [3] [8] 92% of women who develop an anti-D during pregnancy do so at or after 28 weeks gestation. [11] [9] [12]
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