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Serious urinary tract infections (with high levels of WBC, RBC and nitrite) can occasionally cause a false positive pregnancy test result.
also: Reticulocyte Count The FBC comprises the following tests Standard Haemoglobin (Hb) White Blood Count (WBC) Platelet Count (Plt) Red Cell Count (RBC
RBC
A WBC: RBC ratio of 1:500 to 1:1000 is generally regarded as not indicative of infection.
The reaction produces antibodies from the mother’s blood which will stick to the surface of the infant’s red blood cells (RBC).
Elevated Red blood cells: Traumatic tap, Subarachnoid haemorrhage; Xanthochromia screen looking at the RBC breakdown products (bilirubin and oxyhaemoglobin
Red cell Antibodies, RBC typing, crossmatching