How’s this even possible. On the day of blood donation my finger prick hemoglobin was 17.9. Now these things are notoriously over estimating. Every previous donation finger prick test had me at 19 or 20 which was higher then reality. So this 17.9 should also be higher then reality.
Well 8 days after donating blood I did a blood test fully super hydrated and my hemoglobin was 18.4 and hematocrit 54. How’s this possible? I usually drop about 10% on each after a donation.
I had a test like that was substantially higher one week after I had a phlebotomy once. My hematologist ordered another test 24 hours later to validate and it came back much lower. We chalked it up to just an inaccurate test and I have not had it happen again. I have to phlebotomy 3-4 times a year due to the complexity of trying to manage TRT with Hemochromatosis. You may want to retest to ensure it wasn’t just a lab error.
What’s weird is all the other stuff on the CBC was accurate. Like mch, platelets, mchc. I test every 3 months and those values are always the same including on this one.
Dehydration can effect Plasma levels. Both those numbers are % of total blood volume. So if you are dehydrated your numbers can go up.