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Old 09-09-2019, 10:05 AM
 
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This is a simple question. Please do not use this to start a thread debating vaccines.

Can getting a flu shot cause my hematocrit to increase?

I had the shot on Saturday afternoon. Today, Monday morning, I was told my hematocrit was 55 which is high. I've never been above 53 and that is on the high side for me.
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Old 09-09-2019, 01:25 PM
 
Location: Middle of the ocean
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The only thing I know is dehydration can cause that number to be high.
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Old 09-09-2019, 07:48 PM
Status: "Fall is in the Air!" (set 2 days ago)
 
Location: Foot of the Rockies
87,320 posts, read 103,451,537 times
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Quote:
Originally Posted by markg91359 View Post
This is a simple question. Please do not use this to start a thread debating vaccines.

Can getting a flu shot cause my hematocrit to increase?

I had the shot on Saturday afternoon. Today, Monday morning, I was told my hematocrit was 55 which is high. I've never been above 53 and that is on the high side for me.
I don't know, but there is a margin of error in all those readings.
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Old Today, 07:07 AM
 
Location: The Driftless Area, WI
2,912 posts, read 1,129,487 times
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Quote:
Originally Posted by markg91359 View Post
This is a simple question. Please do not use this to start a thread debating vaccines.

Can getting a flu shot cause my hematocrit to increase?

I had the shot on Saturday afternoon. Today, Monday morning, I was told my hematocrit was 55 which is high. I've never been above 53 and that is on the high side for me.

A hematocrit is a pretty crude test-- they take a tube of blood and let it sit , then measure the height of the settled blood. That value can vary from test to test without representing an actual change in your condition...Compare it to trying measuring your height with a yardstick that isn't marked off into inches-- you gotta estimate how many inches over 36 you are. Each time you do it, you may see it a little differently.
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Old Today, 07:09 AM
 
5,356 posts, read 5,286,447 times
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Quote:
Originally Posted by markg91359 View Post
This is a simple question. Please do not use this to start a thread debating vaccines.

Can getting a flu shot cause my hematocrit to increase?

I had the shot on Saturday afternoon. Today, Monday morning, I was told my hematocrit was 55 which is high. I've never been above 53 and that is on the high side for me.
I have never heard of that before but my first question would be to ask if you were properly hydrated.

That is only a 3.7% difference.

That is even within allowable error differences between runs on the same specimen.

My hematocrit bounces all over the place between blood draws (anywhere from 36-42) I don't even pay attention because it's within normal range.

I would just wait and see what the next one is to see if it's actually going up or not.
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Old Today, 07:12 AM
 
5,356 posts, read 5,286,447 times
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Quote:
Originally Posted by guidoLaMoto View Post
A hematocrit is a pretty crude test-- they take a tube of blood and let it sit , then measure the height of the settled blood. That value can vary from test to test without representing an actual change in your condition...Compare it to trying measuring your height with a yardstick that isn't marked off into inches-- you gotta estimate how many inches over 36 you are. Each time you do it, you may see it a little differently.
They don't measure it that way anymore in most places. Most hematocrits are calculated on the instruments. It's the RBC x MCV/10.
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Old Today, 03:45 PM
 
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Quote:
Originally Posted by city living View Post
They don't measure it that way anymore in most places. Most hematocrits are calculated on the instruments. It's the RBC x MCV/10.
Exactly....they haven't measured hematocrit in tube in decades....I worked in a Hematology lab 40 years ago and even then hematocrits were calculated not measured....
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Old Today, 08:56 PM
 
5,356 posts, read 5,286,447 times
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Quote:
Originally Posted by bluedevilz View Post
Exactly....they haven't measured hematocrit in tube in decades....I worked in a Hematology lab 40 years ago and even then hematocrits were calculated not measured....

There are rare occasions that manual hematocrits are performed but usually it is due to some type of interference (something in the patient's specimen) on the analyzer. Very rare.
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