Test/Investigation
CD4/TBNK
Site(s) or Laboratory offering Test/Investigation
NNUH (Immunology)
Units
10^9L
Indications
Measure numbers and percentages of lymphocytes in peripheral blood. Commonly used for: monitoring of HIV; assessment of immunity post immunosuppression; investigation of primary immunodeficiency. NB lymphocyte profiles can be normal in the context of these conditions – do not use for diagnosis of HIV or PID, history/clinical features are paramount.
Sample type
EDTA
Turnaround times (TAT) Urgent/Routine/GP or OPD
2 working days
Reference intervals (adult unless stated)
Age Group CD3 T Cells CD3/CD4 T Cells CD3/CD8 T Cells CD19 B Cells CD16/56 NK Cells
Neonatal 0.600 – 5.000 0.400 – 3.500 0.200 – 1.900 0.040 – 1.100 0.100 – 1.900
1 wk–2 mo 2.300 – 7.000 1.700 – 5.300 0.400 – 1.700 0.600 – 1.900 0.200 – 1.400
2–5 mo 2.300 – 6.500 1.500 – 5.000 0.500 – 1.600 0.600 – 3.000 0.100 – 1.300
5–9 mo 2.400 – 6.900 1.400 – 5.100 0.600 – 2.200 0.700 – 2.500 0.100 – 1.000
9–15 mo 1.600 – 6.700 1.000 – 4.600 0.400 – 2.100 0.600 – 2.700 0.200 – 1.200
15–24 mo 1.400 – 8.000 0.900 – 5.500 0.400 – 2.300 0.600 – 3.100 0.100 – 1.400
2–5 yr 0.900 – 4.500 0.500 – 2.400 0.300 – 1.600 0.200 – 2.100 0.100 – 1.000
5–10 yr 0.700 – 4.200 0.300 – 2.000 0.300 – 1.800 0.200 – 1.600 0.090 – 0.900
10–16 yr 0.800 – 3.500 0.400 – 2.100 0.200 – 1.200 0.200 – 0.600 0.070 – 1.200
Adults 0.700 – 2.100 0.300 – 1.400 0.200 – 0.900 0.100 – 0.500 0.090 – 0.600