What's in a Bodybuilder Blood Panel (and How to Prepare)
"Bodybuilder panels" bundle the tests athletes most often track: blood counts, kidney and liver markers, lipids, hormones and thyroid. Here is what each group measures, and why heavy training can make normal results look abnormal.
Complete blood count (CBC)
Red cells, white cells and platelets. The values athletes watch most are hemoglobin and hematocrit (the share of blood volume that is red cells). Androgens stimulate red-cell production, so hematocrit is one of the most commonly monitored markers for people on hormone therapy. Dehydration also raises it.
Comprehensive metabolic panel (CMP)
- Glucose, plus electrolytes (sodium, potassium, chloride, CO2) and calcium.
- Kidney markers: creatinine, BUN and the estimated GFR. Creatinine comes from muscle, so very muscular people and those taking creatine often read high and get a low eGFR that does not reflect kidney function. Cystatin C is an alternative marker that muscle mass does not affect.
- Liver markers: ALT, AST, alkaline phosphatase, bilirubin, albumin and total protein. AST and ALT are also released by muscle, so a hard session the day before can raise them.
Lipids
Total cholesterol, LDL, HDL and triglycerides. Some panels add ApoB, which counts the atherogenic particles directly and is often considered a better risk marker than LDL alone. Androgens, especially oral ones, are known to lower HDL.
Hormones
Total and free testosterone, estradiol (ideally a sensitive LC/MS-MS assay), SHBG, LH and FSH, and often prolactin. LH and FSH are the pituitary signals that drive natural production. The hormone panel guide explains each marker and the units.
Thyroid, IGF-1 and extras
- Thyroid: TSH, free T4 and sometimes free T3.
- IGF-1: the standard blood marker of growth-hormone activity; see the IGF-1 test guide.
- HbA1c: average glucose over roughly three months.
- PSA for men (commonly from age 40-50), ferritin and iron, vitamin D, and CK (creatine kinase, a muscle-damage marker).
How to prepare
| Factor | Why it matters |
|---|---|
| Fasting 10-12 hours | Glucose, insulin and triglycerides rise after eating; testosterone dips after a meal. |
| Morning draw (about 7-10 AM) | Testosterone and cortisol peak in the morning and fall through the day. |
| No hard training for 48 hours | Heavy lifting raises CK, AST, ALT and creatinine for a day or more. |
| Normal hydration | Dehydration concentrates the blood and inflates hematocrit, hemoglobin and BUN. |
| Pause biotin for 2-3 days (ask your clinician) | High-dose biotin interferes with many immunoassays, including thyroid and some hormone tests. |
| Same lab, same conditions | Methods and reference ranges differ between labs; trends are only comparable like for like. |
This guide explains lab tests. It is not medical advice, does not interpret individual results, and does not endorse using any compound. Review your results with a licensed clinician.
FAQ
What tests are in a bodybuilder blood panel?
Typically a CBC, a comprehensive metabolic panel (glucose, kidney and liver markers, electrolytes), lipids, testosterone (total and free), estradiol, SHBG, LH, FSH, thyroid markers, and often IGF-1, HbA1c, PSA and ferritin.
Can lifting weights affect blood test results?
Yes. Hard training can raise CK, AST, ALT and creatinine for a day or more. Many people avoid heavy sessions for about 48 hours before a draw so the results reflect their baseline.
Why is my creatinine high if I lift?
Creatinine is a breakdown product of muscle, so muscular people and those taking creatine often have higher values and a lower estimated GFR. Cystatin C is an alternative kidney marker that is not affected by muscle mass.