Miscellaneous Normal Values

Question 1

Normal Cervix Length

Answer 1

4 - 5 cm

Question 2

Anti-D immunoglobulin (RhoGAM) Prophylaxis Dose

Answer 2

300 micrograms

Question 3

B-HCG

Answer 3

• Positive in serum: 8-9 days post-conception
• Positive in urine: 28 days after 1st day of LMP
• HCG will double every 2nd day of pregnancy until week 10
• At β-hCG level: 1,500–2,000 mlU/mL embryo will be visible with TVUS

Question 4

Crown-Rump Length (CRL)

Answer 4

• Approx. 5 cm at 12 weeks

Question 5

Normal Nuchal Translucency (NT)

Answer 5

• < 3 mm

Question 6

Normal Fetal Scalp Blood pH

Answer 6

• 7.25-7.30