Wbc

Neutrophils (includes bands) Lymphs Monocytes Others (includes)

Clear and colorless 0 to 1/mm3 0 to 5/mm3 2% to 6%

Clear and colorless Pale yellow and clear

Included with others Monocytes and macrophages 65% to 75%

Pale yellow and clear 0 to 1/mm3 0 to 200/mm3 <25%

Included with others

Monocytes and macrophages 65% to 75%

See Figures 20.11, 20.12, and 20.13 for fluid cells.

adds 50 pL of aPTT reagent, continuing with another incubation for 3 minutes, and finally adds 50 pL of calcium chloride to the specimen (Fig. 20.15).

Results

1. Reference range: PT 9.8 to 11.7 seconds INR 2.0 to 3.0

2. Reference range: aPTT 25.0 to 31.0 seconds

3. Critical results a. PT >50.00 seconds b. INR >4.9

c. aPTT >100.00 seconds

Limitations

1. Specimens with hematocrits greater than 60% will affect clotting times, with a clotting time that is falsely prolonged.

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