Clinical Laboratory Hematology 3rd Edition by Shirlyn McKenzie, Lynne Williams

تمرين 20

Heidi, a 54-day-old female, was admitted to the hospital because of recurrent respiratory distress and failure to gain weight. She was born prematurely at 35 weeks gestation by urgent Cesarean section. Her mother was immune to rubella and had negative serologic tests for syphilis.
Consider why the lymphatic system should be evaluated in this child and the possible etiology of repeated respiratory problems.
Admission CBC on Heidi was WBC:
Hct: 0.55 L/L; Plt:
and differential: 84% segs, 2% bands, 4% lymphocytes, 8% monocytes, and 2% eosinophils.
Heidi weighed 2 pounds 1 ounce at birth. Tests for CMV and toxoplasma infections were negative. At 4 days of age, she was transferred to a special facility for feeding and growth monitoring. She developed a diaper rash that failed to respond to many measures. No thrush was found. At 44 days, she developed pneumonia from coagulase-negative staphylococci that responded to antibiotics. Her WBC count was
with a differential of segs 42%, bands 5%, lymphocytes 1%, monocytes 28%, eosinophils 23%, and basophils 1%.
What is the absolute lymphocyte count?