Mid-Camp Bloodwork for Fighters: Which Labs Matter, What the Numbers Mean, and When to Adjust

Most fight camps treat bloodwork the same way they treat the dentist: an appointment you make after something hurts. The fighter feels flat in week 6 of camp, the coach assumes overtraining, and nobody draws blood until either the body composition test goes sideways or the doctor signs off the pre-fight medical four days before weigh-in. By then the camp is over and the labs are a post-mortem.

The smarter pattern is mid-camp bloodwork. One draw, eight to twelve markers, pulled four to six weeks out from the fight, read against the cut, the brain-health baseline, and the training load. The cost is real but small. The information is the difference between a camp where adjustments are made on data and a camp where adjustments are made on vibes.

This is the panel I order on fighters in camp, when I order it, and what each number is telling me about whether the athlete in front of me is camp-ready or already starting to decompensate in ways the training metrics will not catch for another two weeks.

When to Order

For a standard 8–12 week professional camp:

Baseline draw, 4–6 weeks out from fight night. Early enough to act on the result, late enough that camp stressors have started to show. A draw at week 1 of camp is essentially a fitness-for-camp screen — useful, but it does not capture the impact of the work the fighter is about to do.
Repeat draw, 5–7 days out from weigh-in. Only if the fighter is doing a meaningful cut (≥4% body mass) or if the mid-camp panel flagged anything that warranted re-checking before the cut compounds it.
Post-fight draw, 2–4 weeks after a competition with a documented concussion or hard knockdown. This is a separate workflow tied to concussion recovery nutrition, not a camp marker.

For amateurs and shorter camps, one draw at the 3–4 week mark covers most of the value. For tactical operators on continuous duty, quarterly is the working cadence.

The Panel

Eight categories, twelve to fifteen markers depending on the fighter’s history. Every fighter gets the core. The optional add-ons depend on sex, weight class, prior labs, and whether the camp is pre-pro or championship-level.

1. Iron Status

Order: ferritin, serum iron, total iron-binding capacity (TIBC), transferrin saturation (TSAT), hemoglobin, hematocrit, MCV.

The single highest-yield panel for any combat athlete, and the most underordered. Combat athletes lose iron through three mechanisms that sedentary populations do not — foot strike hemolysis during running conditioning, GI micro-bleeding during heavy training, and hepcidin suppression of iron absorption in the hours after intense sessions. Female fighters lose additional iron through menstruation. Fighters cutting weight on restricted protein intake lose absorbed iron faster than they replace it.

The targets I work from for fighters in camp, which run tighter than the general population reference ranges your lab will print:

Ferritin: ≥ 50 ng/mL for male fighters, ≥ 40 ng/mL for female fighters. The lab will flag “deficient” only below 15–30 ng/mL. That threshold is a rickets-era number and predicts overt anemia, not performance decrement. Fighters with ferritin in the 20–40 range routinely report flat energy, prolonged recovery, and ceiling on conditioning gains even with normal hemoglobin.
TSAT: 25–45%. Below 20% suggests functional iron deficiency even if ferritin looks acceptable. Above 50% in a fighter who is not supplementing aggressively warrants a hereditary hemochromatosis screen before continuing.
Hemoglobin: > 14 g/dL male, > 12.5 g/dL female. A drop of more than 0.5 g/dL between draws in a fighter who was previously stable is meaningful even if the absolute value is still in range.

If ferritin is low but hemoglobin is normal, the fighter is in pre-anemic iron depletion — start supplementation immediately, recheck in 6 weeks. If hemoglobin is also low, refer for GI workup before assuming it is just diet. The full mechanism and supplementation protocol lives in iron deficiency in athletes — the silent performance killer; the bloodwork is how you find out the fighter is in it.

2. Vitamin D

Order: 25-hydroxyvitamin D, or 25(OH)D.

The marker that decides whether the fighter is supporting bone density, immune function, testosterone production, and the brain-health baseline you want in place for camp.

Targets for combat athletes, which run higher than the general adult reference range because the cumulative head-contact load benefits from the upper end of sufficiency:

30–50 ng/mL: sufficient for general adult health. Acceptable floor for fighters in light training.
40–60 ng/mL: my target for fighters in active camp. The range associated with the strongest immune outcomes and the upper end of testosterone support in supplementation trials.
Below 30 ng/mL: insufficient. Begin correction at 4,000–5,000 IU D3 daily with fat-containing meals, recheck at 8 weeks. Most fighters in northern latitudes during winter camps land here without supplementation.
Above 80 ng/mL: pull back the supplement dose. Not toxic in itself, but a fighter pushing past 80 ng/mL is usually overdosing and not bothering to test.

Vitamin D status pairs directly with the brain health nutrition baseline for combat athletes — a fighter taking head contact in camp with serum 25(OH)D in the low 20s is not getting the protective benefit the daily nutrition work is supposed to deliver.

3. Hormonal Panel

Order (male fighters): total testosterone, free testosterone, sex hormone binding globulin (SHBG), cortisol (morning), TSH, free T3.

Order (female fighters): estradiol, progesterone (timed if cycling), LH, FSH, cortisol (morning), TSH, free T3.

This is the panel that tells you whether the cut and the training load are eating the fighter’s endocrine system.

The decision-driving numbers:

Total testosterone (male): > 500 ng/dL in camp. A reading in the 300–500 range in a healthy 25-year-old fighter mid-camp is a red flag — energy availability is too low, the cut is too aggressive, or sleep and recovery are crashing. Below 300 warrants a referral and a hard look at whether the camp continues as planned.
Free T3: > 2.8 pg/mL. The single most sensitive marker of low energy availability. T3 drops before testosterone drops, before menstrual disruption shows up, before the fighter notices fatigue. A free T3 in the 2.0–2.5 range mid-camp is the body downshifting metabolism because the energy availability is not there to sustain the work.
Morning cortisol: 8–18 µg/dL. Above 18 in a draw timed correctly suggests sustained training stress without adequate recovery. Below 8 in a fighter mid-camp is rare and warrants endocrine workup.
TSH: 0.5–2.5 µIU/mL. Outside this range, refer for thyroid workup before continuing to push training load.
Estradiol (female): cycle-phase appropriate. Loss of menstrual function in a fighter mid-camp is not a normal training response — it is REDs presenting itself, and the camp needs an energy-availability audit immediately.

The hormonal panel is where the weight cut science shows its consequences. A fighter with a “successful” cut on the scale and a free T3 of 2.1 mid-camp is not winning — they are leaving function on the table that will show up in round three.

4. Inflammation and Muscle Damage

Order: creatine kinase (CK), high-sensitivity C-reactive protein (hs-CRP), erythrocyte sedimentation rate (ESR).

The training-load markers. These are not diagnostic of any specific condition — they are the noise floor of how much the fighter’s body is breaking down compared to a reasonable baseline.

CK: 100–400 U/L is unremarkable for an athlete in camp. 400–1,000 suggests heavy training in the recent days. Above 2,000 in a fighter who hasn’t been through obvious heavy contact is worth pausing on — could be inadequate recovery, could be early rhabdomyolysis risk, definitely warrants a hydration and training-load audit.
hs-CRP: < 1.0 mg/L for a healthy fighter. Chronically elevated (> 3.0 mg/L) without an obvious infection suggests systemic inflammation worth investigating — gut issues, undiagnosed allergy, smoldering joint or dental issue, or overtraining.

These markers are most useful as trend data across multiple draws. A single CK reading in isolation tells you what the fighter did in the last 72 hours, not what is wrong long-term.

5. Kidney and Liver

Order: comprehensive metabolic panel (CMP) — sodium, potassium, chloride, BUN, creatinine, glucose, AST, ALT, total bilirubin, alkaline phosphatase, albumin.

The basic safety panel that should not get skipped just because the fighter feels fine.

The numbers I read most carefully on a fighter mid-camp:

BUN/creatinine ratio: 10–20. Above 20 in a fighter who is cutting suggests pre-renal hydration deficit — the cut is happening on a body that is already running dry between sessions, which is the setup for an acute kidney injury during a hard cut.
Sodium: 138–145 mEq/L. Below 135 in a fighter doing high-volume sweat work suggests they are over-drinking plain water without sodium. This is the same physiology that produces post-weigh-in cramping; surfacing it mid-camp is a chance to fix the hydration protocol before the cut starts.
AST/ALT: < 50 U/L each. Elevated AST + ALT in a fighter not taking supplements known to elevate liver enzymes can suggest a supplement contaminant — particularly in a fighter using imported pre-workouts or fat-burners. Investigate before continuing.
Glucose: 70–95 mg/dL fasting. A reading above 100 in a young fighter is worth re-checking; insulin resistance in combat athletes is rare but real, especially in fighters who put on size in the off-season with a high-carb, high-volume eating pattern.

6. Lipids (Optional, Annual)

Order: lipid panel — total cholesterol, LDL, HDL, triglycerides.

Not a per-camp marker. Annual at most for an asymptomatic fighter under 35. Useful in older masters athletes and in tactical operators with cardiovascular family history. Worth knowing the baseline once.

7. Glycemic Markers (Optional, Annual or As-Indicated)

Order: hemoglobin A1c, fasting insulin.

Same logic as lipids — not per-camp, but worth a baseline annually for any fighter over 30, anyone with a family history of Type 2 diabetes, and anyone whose body composition has shifted toward central adiposity in the off-season.

8. Specialty Add-Ons by Context

For female fighters with menstrual irregularity or REDs concern: add prolactin, DHEA-S, and a bone density scan referral if the menstrual disruption has been ≥ 3 months.

For fighters with documented concussion history: add a baseline neurocognitive screen and discuss with the neurologist whether to track inflammatory markers post-impact going forward.

For fighters using high-stim pre-workouts: consider a urine catecholamine screen if there are arrhythmia symptoms; otherwise, just audit the supplement list and the daily caffeine load.

For fighters on any prescription medication (including TRT outside of tested-sport contexts): the panel changes accordingly. Work with the prescribing physician.

Reading the Panel — The Triage Logic

A complete panel comes back. Some numbers are in range. Some are flagged by the lab. Some are in range but moving in a direction that worries you. The reading order I use:

First pass — life safety. Anything that needs a doctor now: severely abnormal electrolytes, AST/ALT in the hundreds, hemoglobin below 10, glucose above 200, blood pressure issues that prompted the panel. These get a referral immediately and pause camp until cleared.

Second pass — energy availability. Free T3, testosterone, cortisol, ferritin, vitamin D. If two or more are running low or trending the wrong direction, the fighter is not eating enough food to support the camp. The fix is calories and food quality before it is more recovery time or different training programming.

Third pass — training load tolerance. CK, hs-CRP, sleep quality (from the conversation, not the lab), HRV trend (from the wearable, not the lab). If these are stacking with the energy-availability flags, the fighter is overtrained relative to their fueling, not in absolute terms.

Fourth pass — the cut readiness audit. Sodium, BUN/creatinine, ferritin, total testosterone. If any of these is borderline before the cut starts, the cut needs to be reconsidered. A fighter going into a 5% cut with ferritin of 28 ng/mL and BUN/creatinine of 22 is the fighter who shows up to weigh-in dizzy and to the cage flat.

A Worked Example

Pro male fighter, 33 years old, 170 lb division, currently 188 lb, fight 7 weeks out. Mid-camp bloodwork pulled 6 weeks out. Results:

Ferritin 34 ng/mL (lab says “normal,” range 30–400). Hemoglobin 14.2 g/dL. TSAT 22%.
25(OH)D: 26 ng/mL (lab says “insufficient”).
Total T: 410 ng/dL (lab says “low normal”). Free T3: 2.3 pg/mL. Cortisol AM: 19 µg/dL.
CK 680 U/L. hs-CRP 2.1 mg/L.
CMP: sodium 137, BUN/creatinine 21, glucose 88, AST 38, ALT 41. Albumin 4.2.

The lab interpretation says one thing is wrong (vitamin D) and everything else is “normal.” The clinical reading says four things are wrong, all consistent with the same problem: the fighter is in low energy availability six weeks out from a 10% cut.

Ferritin is in functional depletion for an athlete in camp (target ≥ 50).
Vitamin D is insufficient and needs immediate correction.
Testosterone is well below the camp target for a 33-year-old at 188 lb.
Free T3 is borderline-low, suggesting metabolic downshift.
Cortisol is elevated, suggesting the training-recovery balance is broken.
BUN/creatinine is borderline high, suggesting chronic mild hydration deficit.

The right adjustments before continuing to push toward weigh-in:

Calories up immediately. The fighter has been pushing into the deficit too early in camp. Add 300–500 kcal/day to slow the cut and refill energy availability.
Iron supplementation: 65 mg elemental iron every other day with vitamin C and away from training and dairy. Recheck ferritin at 8 weeks.
Vitamin D3: 5,000 IU daily with fat-containing meals. Recheck at 8 weeks.
Hydration protocol audit. Adding 500–700 mg sodium/L to in-session fluid and an extra 1 L/day total volume. Recheck BUN/creatinine at the pre-weigh-in draw.
Sleep audit and training-load conversation with the head coach. Cortisol elevation in a fighter who is already in LEA is a setup for the camp coming apart in week 4–5 of the remaining 6 weeks.
Reconsider the cut depth. A fighter walking into weigh-in week with low ferritin, borderline-low free T3, and a testosterone that started below the camp target is the fighter who underperforms. The 10% cut should probably become a 7% cut and the fighter accepts a one-weight-class adjustment for the next fight.

Without the mid-camp draw, none of this is visible until the fighter is dragging through round three of a fight they should have controlled.

Common Mistakes

Ordering “a basic panel” without specifying ferritin and vitamin D. The standard primary care panel does not include either. Specify both on the requisition or the draw is missing the two highest-yield markers for combat athletes.

Reading lab reference ranges as athlete targets. Lab ranges are derived from sedentary adult populations. A ferritin of 32 ng/mL is “normal” for a 60-year-old desk worker and “functional depletion” for a 28-year-old fighter mid-camp. Use athlete-appropriate targets.

Skipping the female-specific panel on female fighters. Cycle-phase appropriate estradiol and progesterone, prolactin if menstrual disruption is present, and an explicit conversation about menstrual function belong on every female fighter’s mid-camp draw. Defaulting to the male panel misses the most common female-athlete-specific decompensation pattern.

Pulling blood the morning after a hard session. CK, AST, and ALT will all be elevated transiently. Pull blood on a recovery day, ideally 48 hours after the last hard session, ideally fasted, ideally before 9 a.m. for cortisol.

Acting on a single low number in isolation. A free T3 of 2.5 in a fighter who is sleeping well, training well, and on calories means the fighter has a low T3 set point. The same number in a fighter who is dragging means the fighter is in LEA. The conversation matters as much as the number.

Treating “normal” lab flags as the green light to keep pushing. The lab is asking “is this person sick?” The coach and dietitian are asking “is this fighter optimized?” The two questions have different thresholds. A panel that comes back without a single lab flag does not mean the fighter is camp-ready.

Not repeating the draw. Blood markers are trend data. One draw is a snapshot; two draws six weeks apart is a story. Always plan the second draw at the time the first is ordered.

The Bottom Line

Mid-camp bloodwork is the cheapest decision-support tool in a fight camp. One draw at week 4–6, twelve to fifteen markers, an hour of clinician time to interpret, and the camp from that point forward is running on data instead of guesses.

The fighters who lose third rounds they should be winning are rarely the ones who got out-trained. They are the ones who walked into the cage with ferritin in the 20s, free T3 below 2.5, and a sodium that was creeping low for the last three weeks of camp — and nobody in the room knew because nobody pulled the blood.

Order the panel. Read it against the camp, not against the lab’s reference ranges. Adjust the work, the food, and the cut depth on what the numbers show. The fighter on Saturday night is the one your protocol built — and your protocol is only as good as the data it is running on.