Hematocrit

Question 1

RPM Must be checked PERIODICALLY with a

Answer 1

Tachometer

Question 2

Spin for _____ at ____

Answer 2

5 minutes
10,000 RPM

Question 3

Results of the Hct should agree within

Answer 3

1% [+- 0.01 L/L]

Question 4

Trapped plasma causes hematocrit to be _____ higher than the value derived from automated intruments.

Answer 4

1% to 3%

Question 5

small amount of plasma that remains in the erythrocyte portion of the spun Hct even when proper centrifugation is used

Answer 5

Trapped plasma

Question 6

Clinically defined as increased hematocrit level above normal

Answer 6

Polycythemia

Question 7

elevated total red cell mass

Answer 7

Absolute polycythemia

Question 8

Normal total red cell mass BUT Hct is increased because plasma volume decreased

Answer 8

Relative polycythemia

Question 9

Suprious polycythemia (stress)

Answer 9

Gaisbock’s syndrome

Question 10

Polycythemia vera has a mutation in

Answer 10

JAK2 V617F

Question 11

It is ordered with other test to detect and monitor the course of inflammatory condition such as RA

Answer 11

ESR

Question 12

Westergren results are determined after

Answer 12

1 hr and after 2 hrs

Question 13

A.C used in Westergren

Answer 13

3.8% Sodium citrate
4:1

Question 14

results are determined after 1 hr, most commonly used methods

Answer 14

Modified westergren

Question 15

Anticoagulant used in Wintrobe

Answer 15

Double oxalate or EDTA