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Checking Hematocrit AM fasted or later in day?

iron lifter

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My blood work has typically included a CBC panel and since its usually has other things that require fasting its been done first thing after waking up.

i see some trainers say to always drink 1 liter of water 1 hour before the draw to ensure proper hydration. doing this my hematocrit which is let say 52, now becomes 51.

yet if i further check it way later in day when fully hydrated etc, its almost 50.

some say you shouldn't do this as it skews the results, but if you think about it i would say checking it first thing in morning fasted when you are dehydrated or gone 8 plus hours without water isn't a true representation of your hematocrit ?

we spend 16 hours of the day eating and drinking so it makes sense to check it when ingesting a few liters of water?

thoughts on this?
 

The Runner

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My blood work has typically included a CBC panel and since its usually has other things that require fasting its been done first thing after waking up.

i see some trainers say to always drink 1 liter of water 1 hour before the draw to ensure proper hydration. doing this my hematocrit which is let say 52, now becomes 51.

yet if i further check it way later in day when fully hydrated etc, its almost 50.

some say you shouldn't do this as it skews the results, but if you think about it i would say checking it first thing in morning fasted when you are dehydrated or gone 8 plus hours without water isn't a true representation of your hematocrit ?

we spend 16 hours of the day eating and drinking so it makes sense to check it when ingesting a few liters of water?

thoughts on this?
I always try and check a bit later after hydrating. Unless you're severely dehydrated, I don't think the timing will make a huge difference in results.
 

Canuck54

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My hematocrit changes and improves as the day goes on and I hydrate. You should be about to burst when they draw your blood, and also hydrate the day before. I’ve got up early and tried to drink as much as I could before an AM draw but my levels are always better after 5 pm. I’m talking 2-3 points so it isn’t massive.
 

j4ever

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as mentioned it will be higher if you get blood work when you wake up.
 

alfresco

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My blood work has typically included a CBC panel and since its usually has other things that require fasting its been done first thing after waking up.

i see some trainers say to always drink 1 liter of water 1 hour before the draw to ensure proper hydration. doing this my hematocrit which is let say 52, now becomes 51.

yet if i further check it way later in day when fully hydrated etc, its almost 50.

some say you shouldn't do this as it skews the results, but if you think about it i would say checking it first thing in morning fasted when you are dehydrated or gone 8 plus hours without water isn't a true representation of your hematocrit ?

we spend 16 hours of the day eating and drinking so it makes sense to check it when ingesting a few liters of water?

thoughts on this?
As long as you are ‘normally’ hydrated I don’t think it makes a bit of difference.

I have had my hematocrit tested in a variety of conditions / variables and a few points is about all it waivers.

What you are really looking for is apples to apples; having it tested under consistent conditions so if things go south you know where to point your finger.

And when it is all said and done, hydration will have the biggest impact in my opinion, just don’t overdo it. Be reasonable.
 

iron lifter

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its not required, the problem is one might come back with hematocrit of 55 when its actually 52 later in the day. we spend most of our time hydrated so it should be noted that doing it fasted may skew the results in a negative favour.

this is why most heart attacks happen between 4am and 10 they say as that is when blood is thickest. drinking a few liters of water 1 hour before a fasted test could give better true readings. and 2-3 points is a big difference for geared users. to the gen pop who is running hematocrit of 48 in morning might be 46 its not a big deal.

now if your coming back with a high hematocrit way later in the day after you have had plenty of fluids than you can imagine its even higher first thing in morning so just something to keep in mind.
 

[email protected]

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sorry if i am a bit OT, but what is your opinion on giving blood once HCT > 55 and HB > 18,5? Additionally, heart sufficiency stage II-III.
due to the decreased oxygen saturation (and despite dropping test cyp as low as 7-9mg daily) my hct is around 54-56 and my HB around 19.
RBC is 6,1.
Now i have heard different opinions from my docs (as on almost every topic which sucks)
some say giving blood aint good even when ferritine and iron levels are high, other say giving blood is mandatory if values as mentioned above are exceeded.
 

mike036

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sorry if i am a bit OT, but what is your opinion on giving blood once HCT > 55 and HB > 18,5? Additionally, heart sufficiency stage II-III.
due to the decreased oxygen saturation (and despite dropping test cyp as low as 7-9mg daily) my hct is around 54-56 and my HB around 19.
RBC is 6,1.
Now i have heard different opinions from my docs (as on almost every topic which sucks)
some say giving blood aint good even when ferritine and iron levels are high, other say giving blood is mandatory if values as mentioned above are exceeded.
Have you been tested for sleep apnea ?
 

iron lifter

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sorry if i am a bit OT, but what is your opinion on giving blood once HCT > 55 and HB > 18,5? Additionally, heart sufficiency stage II-III.
due to the decreased oxygen saturation (and despite dropping test cyp as low as 7-9mg daily) my hct is around 54-56 and my HB around 19.
RBC is 6,1.
Now i have heard different opinions from my docs (as on almost every topic which sucks)
some say giving blood aint good even when ferritine and iron levels are high, other say giving blood is mandatory if values as mentioned above are exceeded.
what is your BP and platelets and iron stores. if those are elevated its best to consult your doctor. donating blood could be helpful in that situation. it can drop it 2-3 points.

sleep apnea is another hidden thing that can further exacerbate a condition.
 

[email protected]

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sleep apnea is diagnosed but treated with CPAP/APAP since march this year.
BP is rather on the lower side due to all the medication i have to take (entresto, nebivolol etc.
 

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