Blood test one day before race?

dont take a blood test before a race. all that matters is the actual race.

It’s like 10 mL - it’s fine

On the positive side, you can run with increased confidence in your bilirubin and creatinine levels.

You have on the order of 5 liters of blood. They might have taken 30 ml. You will be fine.

Can you explain in simple words what does it mean? xD

thanks for the reply!

I would have guessed that, too, but I don't know much.

I've been curious about this because I've read that one benefit of all running volume/mileage, with some specific attention to long runs, is the increase in blood volume/plasma volume.

I've also read that one benefit of training in heat is increase in blood volume/plasma volume.

What I haven't seen is just how much of an increase a runner might experience and how that correlates to performance. Of course, when some coaches suggest maintaining certain types of runs leading up to the race for the purpose of maintaining blood volume, then if they're talking about trying to hold onto 100 ml for performance purposes, I'd consider 30ml significant. And as I said, I don't know, but I doubt that coaches making such suggestions are helping people avoid very substantial blood volume decreases from peak (e.g., I doubt anyone drops 500 ml, but what do I know?).

Since you seem knowledgeable about this, do you have any info?

They are taking roughly 0.5% of your red blood cells. If RBC count were 100% of performance, it would be 1.5 seconds for a 5-minute miler. If it's 10% of performance, it amounts to a well-timed lean.

If you finish 2nd place or 4th place then you made a foolish error, otherwise, not a big deal.

finished in 3rd actually hahaha

Good.

Just be aware that test values may be abnormal if drawn in close proximity to a hard effort. Troponin can be elevated within a day or so of a race, for example, so whoever interprets your test results could think you’re having a heart attack when in reality you just ran a hard effort within a day of the blood draw.