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Flashcards in Coagulation And Thrombocytes Deck (34):
1

Stages of platelet hematopoiesis?

Megakaryoblast, promegakaryocyte, megakaryocyte, platelet

2

Made of lit pink cytoplasm and distinct purple granules

Platelets

3

Large platelets (immature)

Macro platelets

4

Three main functions of platelets?

Clotting, preserve capillary walls, transport substances for clotting, and for constriction and dilation of blood vessels

5

Are platelets larger or smaller than RBCs?

Smaller

6

Platelets in ______ vary in size, shape and clumping

Cats

7

Platelets in _____ are relatively uniform in size.

Dogs

8

Macro platelets are normal in....

Cats

9

What do macro platelets indicate in dogs?

Increased platelet use and a need for increased platelet production

10

Normal platelet value for dogs.

150,000 plts/uL - 450,000 plts/uL

11

Normal platelet values for cats.

200,000 plts/uL- 600,000 plts/uL

12

Variation in the size of platelets.

Pleomorphic

13

Cannot stop bleeding at this platelet count number.

50,000 plts/uL

14

Increased of platelets.

Thrombocytosis

15

Two causes of Thrombocytosis?

Injury/trauma/infection or steroids/splenectomy

16

Decrease in number of platelets.

Thrombocytopenia

17

Three main causes of thrombocytopenia?

Hormone disorder, disorders of platelet distribution, vitamin b12 injection

18

Method one of platelet count.

Viewing 10 fields, averaging the fields and reporting them.

19

Normal platelet per field?

7-10 platelets/hpf

20

Method two ***** of platelet count?

Count and record in ten fields, average them, and times by 15,000 = platelets per microliter

21

Cannot accurately count_____ platelets.

Clumped

22

Small pinpoint hemorrhages.

Pettichia

23

Blotches of hemmorage (usually abdomen)

Echymosis

24

Visible bleeding.

Frank

25

Hidden bleeding,

Occult bleeding

26

Large amounts of blood

Profuse bleeding

27

Steps of clotting?

1. Platelets plug, 2. Clotting factors reinforce plug, 3. Fibrin web acts like glue, 4. Other cells reinforce web

28

Extrinsic

PT

29

Intrinsic

PTT

30

Five sizes/types of platelets?

Macro platelets, micro platelets, increased platelets, decreased platelets, clumped platelets

31

Platelets size of a red cell.

Macro platelet

32

The glue.

Fibrin

33

What do you have to do when you see clumped fibrin?

Send the sample out

34

Which organ produces the most clotting factors?

Liver