Pregnancy test Flashcards

1
Q

test use to detect hCG

A

Pregnancy test

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2
Q

it is produces by syncytrophoblast cells ofthe placenta during pregnancy

A

hCG

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3
Q

identical to alpha-subunit of other hormones in the glycoprotein family, including LH, FSH and TSH

A

Alpha Subunit of hCG

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4
Q

determines the biological and immunological specificity of CG

A

Beta - subunit

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5
Q

what increases dramatically during the first trimester after reaching a peak at about 16 weeks gestitation

A

serum hCG

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6
Q

what subunit is present if the first trimester

A

beta subunit

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7
Q

what subunit appears in the 2nd trimester and steadily increase in last trimester

A

alpha subunit

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8
Q

what is a reliable indicator of pregnancy

A

elevated hCG in maternal and urine

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9
Q

reference interval of serum hCG

A

4-6mlu/ml

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10
Q

commonly measured by qualitative immunoassay test kuts with detection limits to approximately 20mlu/ml

A

urine hCG

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11
Q

when is can serum hCG detect the elevated hCG

A

4 - 6 days

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12
Q

when can urine hCG can be detected elevated hCG

A

2 - 3 days

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13
Q

what are the causes a false-positive result

A

ectopic pregnancy, germ cell tumor, gastational disease ect.

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14
Q

what causes a false negative result

A

early measurement after constipation, dilute urine, hoot effect

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15
Q

when a patient with early gestational vaginal bleeding or abdominal pain suggest

A

ectopic pregnancy or spontaneous abortion

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16
Q
  • allows more accurate diagnosis and sound management than are obtained by clinical judgment alone
  • can be use to detect intrauterine implantation
A

Quantitative measurement for pregnancy

17
Q

what indicates abnormal pregnancy with 99% sensitivity

A

Increase in serum hCG of less than 53% in 2 days

18
Q

what provides a greater than 80% probability of intrauterine implantation of fertilized ovum

A

doubling of hCG in 2 days

19
Q

what could happen if there is failure to double the serum hCG

A

Ectopic pregnancy

20
Q

best urine specimen for pregnancy

A

First morning specimen

21
Q
A