Q.
15: What is meant by False Positive
and False negative hCG Tests??
False negative readings can occur when testing is done too early and earlier the test is performed the higher the
chance of a false negative results. A false
negative result can also stem
from using a diluted urine sample
apart from taking a test too early in pregnancy. First morning urine
contains the most concentrated presence
of hCG which makes it the ideal
sample for pregnancy testing . False
positive tests are rare through
there are instances and conditions where they
can occur. In case some
tissues in a non pregnant women
produce hCG it may give a
false positive test.
False positive
results can result
from diseases like chorio carcinomas. IgA deficiencies hetero plastic diseases gestational trophoblastic neoplasms and testicular germ cell
malignancies . Secondly
research indicates that half
of all conception do not go forward to develop as pregnancy and may abort. A false positive can be seen in
this situation.
Medications
that can cause a false positive
are the fertility medications
that contain hCG. However fertility drugs and medications that do not contain hCG will not precipitate false positive as well .
A
percentage of false positive pregnancy
tests
can also be
attributed to
misinterpretation of results due to a failure to
follow UPT test instructions with precision. Additionally at the same
gestational stages women produce
quantitatively different
levels of hCG . Hence the first indication of a positive result on a home pregnancy
test may vary between women despite
similar gestational stage.
Q. 16:-If we are entrusted to carry
out UPT at our clinic by yourself/ by
your clinic staff then teach clinic staff hat there is one term called.”Evaporation
time”: Have U talked to your staff in
this regard. :
Moreover many home pregnancy
tests show a positive
or unclear result when read
well after the suggested 3-5
minute window; independent of an actual
pregnancy. This type of false positive
is known as an evaporation line.
Q. 17: WE
heard of phantom leg syndrome(people who had amputation of one leg due to
street injury-sometimes get severe pain in that excised leg!!) Similar Phantom hCG inks possible : Some
individuals react to some substrate in the
test and thus will display a consistently low positive
blood pregnancy test even though
they are not pregnant. This
phantom hCG may lead to serious
misdiagnosis and intervention,
but can be detected with serial
dilutions. Patients with phantom
hCG have a positive blood hCg but a negative urine hcG test
No comments:
Post a Comment