Common Antepartum Labs and Testing

Question 1

What are the 11 tests done between 8-12 weeks of gestation?

Answer 1

• CBC, Hgb, Hct
• blood type, RH factor, antibody screen
• HIV
• Rubella (titer should be at least 1:8)
• Hepatitis B (HBsAg)
• UDS (urine drug screen) urinalysis
• RPR/VDRL (antibodies to cardiolipin antigens), treponemal antibody tests tests for treponema pallidum antibodies
• pap (papanicolaou) tests
• Gonorrhea and chlamydia cultures
• ultrasound for pregnancy dating

Question 2

When is pregnancy dating most accurate?

Answer 2

first 13 weeks

Question 3

What test is done between 12-24 weeks of gestation?

Answer 3

genetic screens

Question 4

What is included in genetic screening?

Answer 4

• MSAFP (16-18 weeks)/Triple Screen/Quad Screen
• Genetic Carrier Testing (progenity)
• CVS/Aminocentesis
• Ultrasound

Question 5

What are the 2 tests done between 24-28 weeks of gestation?

Answer 5

• Antibody screen on Rh negative patients

- glucose screen (1 hour glucose screening

Question 6

What should you do if the Rh is negative?

Answer 6

Give Rh0 immune globulin (about 28 weeks)

Question 7

What should you do if the 1 hour glucose screening is abnormal (140 or greater)?

Answer 7

3 hour GTT

Question 8

What are the 5 tests done between 24-40 weeks of gestation?

Answer 8

• CBC
• RPR/VDRL or treponemal test
• HIV
• HBsAg
• In hospital-blood type and Rh, clot to hold

Question 9

What is the test done between 35-36 weeks of gestation?

Answer 9

group B streptococcus screening

Question 10

What will positive Group B streptococcus women require during labor?

Answer 10

antibiotics

Question 11

What will unknown status of Group B streptococcus need during labor?

Answer 11

antibiotics, always assume positive and treat

Question 12

Do scheduled C-sections need to be treated for Group B streptococcus?

Answer 12

no, it is not necessary to treat