Low values in men usually trace to iron, B12, or folate, heavy endurance volume, or a source of blood loss that needs a physician to find. High hematocrit is a physician question and can reflect dehydration, smoking, low overnight oxygen, or certain prescribed therapies. Executive Health Edge draws a complete blood count at month 0, 6, and 12 and reads it with ferritin, B12, and folate; anything that warrants a medical decision goes to the program physician.
What the numbers are
Hemoglobin is the protein inside red blood cells that binds oxygen. Hematocrit is the percentage of your blood volume made up of red cells. Both are part of the complete blood count Executive Health Edge draws at month 0, 6, and 12, alongside red and white cell counts and platelets.
Reference ranges vary by lab. Your physician decides what any value means for you.
Why a coach cares
Oxygen-carrying capacity is the ceiling on aerobic work. A man with low hemoglobin can do everything right in his Zone 2 sessions and still see a heart rate that runs high for the pace, sessions that feel like threshold, and a VO2 max that does not move. Because it comes on slowly, he blames age. The blood count usually says otherwise, and it says it six months before he would have found out on his own.
Why it is read with the nutrient block
Low red cell production in men most often traces to iron, B12, or folate. The program draws ferritin, iron, transferrin, B12, and folate on the same panel so that a low hemoglobin comes with its likely reason attached. A low hemoglobin with low ferritin points one way. With low B12, another. The physician makes the call; the coach adjusts the inputs.
What moves it
- Dietary iron, B12, and folate within the protein target. Red meat, shellfish, eggs, and leafy greens do most of the work.
- Endurance volume. Heavy volume expands plasma volume and increases iron loss. It is a programming variable.
- Hydration at the draw. Dehydration raises hematocrit on paper. The lab instructions cover it.
- Smoking, overnight oxygen, and prescribed therapies. Persistently high hematocrit can reflect smoking, low overnight oxygen, or certain prescribed therapies, all physician questions.
- Blood loss. Anything unexplained is a physician question, not a coaching one.
What the research says
- Endurance training dilutes the count. Athletes run lower hemoglobin because an expanded plasma volume dilutes the red cells, a normal adaptation rather than true anemia; true anemia, usually from iron deficiency, also occurs (Eichner, Medicine and Science in Sports and Exercise, 1992).
- In men, low iron usually means blood loss. Recurrent blood loss causes 94% of iron deficiency anemia, and current guidance advises examining the gut to find the source in men, which is why an unexplained low value goes to the physician (Latimer et al., American Family Physician, 2025).
- High hematocrit is a prescribing question. The Endocrine Society guideline lists an elevated hematocrit as a reason not to start testosterone therapy (Bhasin et al., Journal of Clinical Endocrinology and Metabolism, 2018).
- Sleep apnea is not the usual reason. In 1,604 veterans, sleep apnea severity was not linked to hematocrit; low oxygen saturation, smoking, higher alcohol intake, and testosterone therapy were (Nguyen and Holty, Respiratory Medicine, 2017).
What goes to the physician
Any value the lab flags, any low value with no dietary or training explanation, any persistently high hematocrit, and any medication or prescribed-therapy question route to the program physician in writing. The coach does not diagnose anemia or interpret a high hematocrit.
This page is coaching information, not medical advice. Questions about medication, hormones, or peptides go to the program physician.