Table 1.

Laboratory values: Bolded values indicate clinically important results or results outside the reference range.

VARIABLEPEDIATRIC REFERENCE RANGE*RESULT IN 2015RESULT IN 2018
Complete blood count

  • Leukocytes, × 109/L

4.5-13.511.88.3

  • Erythrocytes, × 1012/L

4.00-5.204.614.43

  • Hemoglobin, g/L

115-155129131

  • Hematocrit, L/L

0.340-0.4000.3710.360

  • MCHC, g/L

300-360348364

  • Platelet count, × 109/L

150-400513389

  • Red blood cell distribution width, %

10.5-1312.111.5
Differential count, × 109/L

  • Neutrophils

1.50-8.606.793.84

  • Lymphocytes

1.50-7.003.362.96

  • Monocytes

0.20-0.801.440.86

  • Eosinophils

0.00-0.700.180.62

  • Basophils

0.00-0.100.050.03
ESR, mm/h3-13455
CRP, mg/L0-121.40.2
Rheumatoid factor, klU/L0-22NA< 15
HLA-B27NANANegative
Antinuclear antibodyNANegativeNA
Lyme serology

  • IgM and IgG ELISA

NANAReactive

  • IgM Western blot

NANANegative

  • IgG Western blot

NANAReactive

  • CRP—C-reactive protein, ELISA—enzyme-linked immunosorbent assay, ESR—erythrocyte sedimentation rate, Ig—immunoglobulin, MCHC—mean corpuscular hemoglobin concentration, NA—not applicable.

  • ↵* Reference ranges used at Kingston Health Sciences Centre for pediatric patients.