CBC

Hb (in a child, below 11 is abnormal)

• 26-30 wk: 13.4
• 28-32 wk: 14.5-15
• Full-term baby: 16.5 to 18 (lower in preemies)
• 1-3 days: 18.5
• 2 m/o: 11.2
• child 11.2-13.5 (avg)
• 12-18 y/o
  • male 14.9 (13 is 2 SD below nl)
  • female 14.5 (12 is 2 SD below nl)
• Term infants usually reach mean nadir of 11.5 at 2-3 months of age
• Preterm (<1500 g) usually reach mean nadir of 8 at 1-2 months of age.

MCV

• nbn: 110 fL
• < 2 m/o: 95-108
• 6 m/o to 2 y/o: 70-78
• 2-18 y/o: 75-90

Retic

• nbn: 5-12%
• 1-3 days: 1.8- 4.6
• 1 m/o: 0.1-1.7
• child 0.5-1.0

WBC (x1000/mm3)

• nbn 9-30
• child 6-17

Platelet 150-350 (x1000/mm3)

HbF

• 60-90% at birth, but falls to adult levels (5%) by age 4 mos

Note: RBC's in a newborn have a shorter half-life (70-90 days)